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World War II

Global conflict between the Allies and the Axis powers, conventionally dated 1939–1945

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Contents
  1. Overview
  2. Background and causes
  3. Start and end dates
  4. War in Europe, 1939–1941
  5. Global war, 1941–1943
  6. Allied offensives and Axis defeat, 1943–1945
  7. Casualties and atrocities
  8. Mobilisation and home front in the United States
  9. Aftermath
  10. Historiography and memory
  11. Scripture
  12. Sources
  13. Truth Ledger

World War II, or the Second World War, was a global conflict between two coalitions, the Allies and the Axis powers, conventionally dated from 1 September 1939 to 2 September 1945, although its start and end dates are debated . Nearly all of the world's countries took part, many in total war, and it was the deadliest conflict in history, with an estimated 60 to 75 million deaths, a majority of them civilians . Germany surrendered unconditionally on 8 May 1945, and Japan announced its surrender on 15 August and signed the surrender document on 2 September 1945 . The war was followed by the creation of the United Nations, the emergence of the United States and the Soviet Union as rival superpowers, and an acceleration of decolonisation .

Background and causes

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The causes of the war included unresolved tensions after World War I and the rise of fascism in Europe and militarism in Japan . Under the Treaty of Versailles, Germany lost about 13 per cent of its home territory and all its overseas possessions .

An essay in Foreign Affairs describes the war as a combination of many conflicts, including ethnic and national hatreds that followed the collapse of four empires and the redrawing of borders at the Paris Peace Conference after World War I .

Key events before the war included Japan's invasion of Manchuria in 1931, the Spanish Civil War, the outbreak of the Second Sino-Japanese War in 1937, and Germany's annexations of Austria and the Sudetenland . Japan staged the Mukden incident in 1931 as a pretext to invade Manchuria . On 23 August 1939 Germany and the Soviet Union signed a non-aggression pact whose secret protocol provided for the partition of Poland .

Start and end dates

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The war is generally considered to have begun on 1 September 1939, when Germany invaded Poland . The sources differ on the date of the British and French declarations of war on Germany: the FDR Presidential Library gives 2 September 1939, while Wikipedia gives 3 September 1939 .

Other starting points are proposed, particularly for Asia: the Japanese invasion of Manchuria in 1931, the Italian invasion of Abyssinia in 1935, and the start of the Second Sino-Japanese War in 1937 . The historian Antony Beevor views the Battles of Khalkhin Gol in 1939 as the beginning of the war .

A Foreign Affairs essay argues that national narratives also differ on the start date . It says American popular narratives place the start at US entry after the attack on Pearl Harbor on 7 December 1941, followed days later by Hitler's declaration of war on the United States . It says Russian President Vladimir Putin insists the war began in June 1941 with the German invasion of the Soviet Union, and that the joint Soviet and Nazi invasion of Poland in September 1939 marks the start for most Europeans . In China, according to the essay, the war began in 1937 or earlier, with the Japanese occupation of Manchuria in 1931 . It adds that many on the Spanish left date it to 1936 .

The same essay notes that a number of historians treat the war as a phase of one long war lasting from 1914 to 1945, or even to 1991 .

The end date is also not universally fixed. Japan announced its surrender on 15 August 1945 and signed the surrender document on 2 September 1945 . No peace treaty between Japan and the Soviet Union was signed; a joint declaration in 1956 ended their state of war .

War in Europe, 1939–1941

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Germany invaded Poland on 1 September 1939, and the Soviet Union invaded on 17 September . Poland was partitioned between the two states under the Molotov–Ribbentrop Pact .

In 1940 the Soviet Union annexed the Baltic states and parts of Finland and Romania, while Germany conquered Norway, Denmark, Belgium, Luxembourg and the Netherlands . Paris fell to German forces on 14 June 1940 . After the fall of France the war continued mainly between Germany, assisted by Fascist Italy, and the British Empire and Commonwealth .

In September 1940 the Tripartite Pact formally united Germany, Italy and Japan as the Axis . By mid-1941 Axis countries had also defeated Yugoslavia and Greece . On 22 June 1941 Germany invaded the Soviet Union in Operation Barbarossa, opening the Eastern Front . According to Wikipedia, some 3.3 million Soviet prisoners of war died in German captivity, a mortality rate of nearly 60 per cent .

Global war, 1941–1943

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On 7 December 1941 Japan attacked Pearl Harbor and American and British territories in Asia and the Pacific, and the United States declared war on Japan on 8 December . Germany and Italy declared war on the United States on 11 December 1941 .

The sources give different explanations for the German declaration. The FDR Presidential Library attributes the German and Italian declarations to the Tripartite Pact . Wikipedia states that Germany cited American attacks on German vessels, ordered by Roosevelt, as justification .

Japan conquered much of coastal China and Southeast Asia, but its advance in the Pacific was halted at the Battle of Midway in June 1942 . In early 1943 Axis forces were defeated in North Africa and at Stalingrad . The US Army's official history states that the invasion of North Africa (Operation Torch) in late 1942 began a ground offensive against the European Axis that was sustained almost without pause until Italy collapsed and Germany was defeated .

Allied offensives and Axis defeat, 1943–1945

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An Allied invasion of Italy in July 1943 resulted in the fall of its fascist regime, and Allied offensives in the Pacific and the Soviet Union forced the Axis to retreat on all fronts . On 6 June 1944 the Western Allies invaded France at Normandy, while the Soviet Union advanced into Central Europe . In the Pacific, Japan lost much of its navy and key Western Pacific islands, and suffered defeats in Burma .

Germany surrendered unconditionally on 8 May 1945 . The United States dropped atomic bombs on Hiroshima and Nagasaki on 6 and 9 August 1945 . Japan announced its surrender on 15 August and signed the surrender document on 2 September 1945 .

Casualties and atrocities

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Wikipedia gives an estimate of 60 to 75 million deaths, a majority of them civilians, and says millions died as a result of massacres, starvation, disease and genocides including the Holocaust . This range rests on a single source among those used here .

A Gilder Lehrman Institute essay describes the war as having led to the “virtual annihilation of the Jewish population of Europe” . The excerpt of that essay available to this article gives no figure, and the other sources used here do not give a death toll for the Holocaust .

In 1944 the German suppression of the Warsaw Uprising killed over 150,000 Poles . After the capture of Bataan, some 75,000 Filipino and American prisoners were forced on a death march .

Mobilisation and home front in the United States

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The sources available for this article document the American home front in detail and do not cover the mobilisation of other belligerents or of colonised societies. This section therefore describes the United States only.

According to the US National Park Service, 16 million Americans served in uniform, more than 400,000 died, and the war involved 56 nations . About 400,000 women enlisted for non-combat duties, and more than 1.2 million African Americans served in the military . By 1945 women made up 36 per cent of the US workforce, and wartime production included 296,601 aircraft, 71,060 ships and 86,388 tanks .

The National Park Service states that more than 100,000 relatives of Japanese American servicemen were interned, and that many Japanese Americans volunteered for service in the 100th Battalion and the 442nd Regimental Combat Team . A History News Network essay refers to the forced internment of some 120,000 Japanese Americans . The Office of War Information was established by executive order on 13 June 1942 .

Aftermath

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After the Allied victory, Germany, Austria, Japan and Korea were occupied, and German and Japanese leaders were tried for war crimes . The United Nations was created, with China, France, the Soviet Union, the United Kingdom and the United States as permanent members of its Security Council . The Soviet Union and the United States emerged as rival superpowers, setting the stage for the Cold War .

History.com identifies Soviet expansion into Eastern Europe and the Communist victory in China among the war's consequences . Wikipedia links the war to decolonisation in Africa and Asia, and a Foreign Affairs essay says it accelerated the end of colonialism across Africa, Asia and the Middle East . The sources used here do not describe the experiences of colonised peoples during the war in detail.

Historiography and memory

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The military events of the war have been debated by historians since 1945 . The Cambridge History of the Second World War examines the military cultures and strategic objectives of the eight major powers involved and assesses why one side or the other prevailed in each theatre .

An essay in Foreign Affairs argues that every country involved created and clung to its own narrative of the war, and that these clashing worldviews remain a source of tension in global politics . The essay states that Putin combines homage to Soviet sacrifice in the “Great Patriotic War” with ideas drawn from exiled tsarist White Russians .

In East Asia, interpretation of the war's history is contested. China's government said that to question Beijing's interpretation of the war was a betrayal of history, and accused Taiwan of “desecrating the martyrs” with its criticism, according to Reuters . Reuters also reported that Taiwan's largest opposition party, the Kuomintang, which was the Republic of China's ruling party during the war, said the Taiwanese government had its history right but was criticising Beijing for its own political expediency .

Focus Taiwan quoted scholars who said Xi Jinping's account of the war obscures the role of the Republic of China . One scholar, Kuo, said Xi's reference to fighting fascism also served to highlight Japanese wartime militarism amid strained China–Japan relations . These assessments come from a single outlet, and the sources used here do not set out Beijing's own historical account in detail .

A History News Network essay argues that American popular accounts of the war tend to follow the pattern of the hero's journey, which affirms Americans' beliefs about their national character . It criticises one documentary series for giving little attention to the African American wartime experience, to the racism underlying the war against Japan, and to the internment of some 120,000 Japanese Americans . This is the view of the essay's author .

Scripture

Passages quoted from the King James Version. The text is fetched, never written by a model.

And he shall judge among many people, and rebuke strong nations afar off; and they shall beat their swords into plowshares, and their spears into pruninghooks: nation shall not lift up a sword against nation, neither shall they learn war any more.

Micah 4:3(King James Version)It envisions nations beating swords into plowshares and learning war no more, a hope that answers the devastation of a global war.

And ye shall hear of wars and rumours of wars: see that ye be not troubled: for all these things must come to pass, but the end is not yet. For nation shall rise against nation, and kingdom against kingdom: and there shall be famines, and pestilences, and earthquakes, in divers places.

Matthew 24:6-7(King James Version)Jesus foretells wars and rumours of wars and nation rising against nation, describing the recurringturmoil of human conflict.

From whence come wars and fightings among you? come they not hence, even of your lusts that war in your members? Ye lust, and have not: ye kill, and desire to have, and cannot obtain: ye fight and war, yet ye have not, because ye ask not. Ye ask, and receive not, because ye ask amiss, that ye may consume it upon your lusts.

James 4:1-3(King James Version)It traces wars and fighting to the desires and covetousness within human hearts, speaking to the root causes of conflict.

Come, behold the works of the LORD, what desolations he hath made in the earth. He maketh wars to cease unto the end of the earth; he breaketh the bow, and cutteth the spear in sunder; he burneth the chariot in the fire.

Psalms 46:8-9(King James Version)It declares that God makes wars cease to the end of the earth, offering a vision of peace after destruction.

Sources

  1. 1.
    World War II — Wikipedia (opens in a new tab)

    en.wikipedia.orgWikipedia (CC BY-SA 4.0)

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Truth Ledger

Every checkable claim in the draft, checked by GPT-6.1 Sol and Grok 4.7. A claim is stated as fact only when both checkers confirm it from the cited sources; a split verdict is published with attribution, and a claim neither can confirm is cut.

Showing 44 claims.

  1. Verified

    World War II is conventionally dated from 1 September 1939 to 2 September 1945.

    • Grok 4.7:Supported
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    Source [1] gives these conventional dates while acknowledging debate over the war’s start and end. / Source [1] dates the war 1 September 1939–2 September 1945, while noting disagreement over the end date.

    Cites1

  2. Verified

    The war was fought between the Allies and the Axis powers.

    • Grok 4.7:Supported
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    Source [1] identifies the Allies and Axis powers as the opposing coalitions. / Source [1] describes the conflict as between the Allies and the Axis powers.

    Cites1

  3. Verified

    World War II caused an estimated 60 to 75 million deaths, a majority of them civilians.

    • Grok 4.7:Supported
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    Source [1] explicitly estimates 60–75 million deaths, mostly civilians. / Source [1] states 60 to 75 million deaths, a majority of them civilians.

    Cites1

  4. Verified

    Principal Allied leaders were Churchill, Stalin, de Gaulle, Roosevelt and Truman.

    • Grok 4.7:Supported
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    Source [3] lists all five as Allied leaders. / Source [3] names Churchill, Stalin, de Gaulle, Roosevelt and Truman as Allied leaders.

    Cites3

  5. Verified

    Principal Axis leaders were Hitler, Mussolini and Tojo.

    • Grok 4.7:Supported
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    Source [3] lists Hitler, Mussolini, and Tojo as Axis leaders. / Source [3] names Hitler, Mussolini and Tojo as Axis leaders.

    Cites3

  6. Verified

    Under the Treaty of Versailles Germany lost about 13 per cent of its home territory and all its overseas possessions.

    • Grok 4.7:Supported
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    Source [1] states Germany lost around 13 percent of its home territory and all overseas possessions. / Source [1] says Germany lost around 13 percent of its home territory and all overseas possessions.

    Cites1

  7. Verified

    Japan staged the Mukden incident in 1931 as a pretext to invade Manchuria.

    • Grok 4.7:Supported
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    Source [1] explicitly describes Japan staging the Mukden incident in 1931 as an invasion pretext. / Source [1] says Japan staged the 1931 Mukden incident as a pretext to invade Manchuria.

    Cites1

  8. Verified

    The German–Soviet non-aggression pact of 23 August 1939 contained a secret protocol providing for the partition of Poland.

    • Grok 4.7:Supported
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    Source [1] gives the pact’s date and describes its secret protocol partitioning Poland. / Source [1] says the 23 August 1939 pact had a secret protocol partitioning Poland.

    Cites1

  9. Verified

    Germany invaded Poland on 1 September 1939.

    • Grok 4.7:Supported
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    Sources [1] and [14] both date Germany’s invasion of Poland to 1 September 1939. / Sources [1] and [14] both date Germany’s invasion of Poland to 1 September 1939.

    Cites114

  10. Verified

    The FDR Library gives 2 September 1939 as the date of British and French declarations of war, while Wikipedia gives 3 September 1939.

    • Grok 4.7:Supported
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    The excerpts give those differing dates. Historically, 3 September is correct; the FDR Library excerpt’s 2 September date is erroneous. / Source [14] gives 2 September 1939; source [1] gives 3 September 1939.

    Cites114

  11. Verified

    Proposed alternative start dates include 1931, 1935 and 1937.

    • Grok 4.7:Supported
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    Source [1] discusses Manchuria in 1931, Abyssinia in 1935, and the Sino-Japanese War in 1937 as alternative starting points. / Source [1] lists proposed starts in 1931, 1935 and 1937.

    Cites1

  12. Verified

    Antony Beevor views the Battles of Khalkhin Gol in 1939 as the beginning of World War II.

    • Grok 4.7:Supported
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    Source [1] explicitly attributes this view to Antony Beevor. / Source [1] says Beevor views the 1939 Battles of Khalkhin Gol as the war’s beginning.

    Cites1

  13. Verified

    Putin dates the war's start to the German invasion of the Soviet Union in June 1941.

    • Grok 4.7:Supported
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    Source [2] says Putin insists the war began with Hitler’s June 1941 invasion of the Soviet Union. / Source [2] says Putin insists the war began with the June 1941 invasion of the Soviet Union.

    Cites2

  14. Verified

    Some historians argue that World War II was a phase of one long war from 1914 to 1945 or 1991.

    • Grok 4.7:Supported
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    Source [2] explicitly describes historians proposing a continuous war from 1914 to 1945 or 1991. / Source [2] says some historians treat it as part of a war from 1914 to 1945 or 1991.

    Cites2

  15. Verified

    Japan and the Soviet Union ended their state of war by a joint declaration in 1956 without a formal peace treaty.

    • Grok 4.7:Supported
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    Source [1] states the 1956 joint declaration terminated the state of war, without a formal peace treaty. / Source [1] says no peace treaty was signed; the 1956 joint declaration ended the state of war.

    Cites1

  16. Verified

    The Soviet Union invaded Poland on 17 September 1939.

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    Source [1] explicitly dates the Soviet invasion of Poland to 17 September 1939. / Source [1] dates the Soviet invasion of Poland to 17 September 1939.

    Cites1

  17. Verified

    Paris fell to Germany on 14 June 1940.

    • Grok 4.7:Supported
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    Source [1] states Paris fell to German forces on 14 June 1940. / Source [1] says Paris fell on 14 June 1940.

    Cites1

  18. Verified

    The Tripartite Pact of September 1940 formally united Germany, Italy and Japan as the Axis.

    • Grok 4.7:Supported
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    Source [1] states the September 1940 Tripartite Pact formally united these three Axis powers. / Source [1] says the late-September 1940 Tripartite Pact formally united Japan, Italy and Germany.

    Cites1

  19. Verified

    Germany invaded the Soviet Union on 22 June 1941 in Operation Barbarossa.

    • Grok 4.7:Supported
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    Source [1] explicitly gives 22 June 1941 and the operation’s name. / Source [1] dates Operation Barbarossa to 22 June 1941.

    Cites1

  20. Verified

    Some 3.3 million Soviet prisoners of war died in German captivity, a mortality rate of nearly 60 per cent.

    • Grok 4.7:Supported
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    Source [1] gives approximately 3.3 million Soviet POW deaths in German captivity and a nearly 60 percent mortality rate. / Source [1] states 3.3 million Soviet POW deaths and a nearly 60 percent mortality rate.

    Cites1

  21. Verified

    Japan attacked Pearl Harbor on 7 December 1941, and the US declared war on Japan on 8 December.

    • Grok 4.7:Supported
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    Source [1] dates Pearl Harbor to 7 December; source [14] dates the US declaration against Japan to 8 December. / Source [14] dates Pearl Harbor to 7 December and the US declaration to 8 December 1941.

    Cites114

  22. Verified

    Germany and Italy declared war on the United States on 11 December 1941.

    • Grok 4.7:Supported
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    Source [14] explicitly dates both declarations to 11 December 1941. / Source [14] says Germany and Italy declared war on the United States on 11 December 1941.

    Cites14

  23. Verified

    Germany cited American attacks on German vessels ordered by Roosevelt as justification for declaring war on the US.

    • Grok 4.7:Supported
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    Source [1] states Germany cited Roosevelt-ordered attacks on German war vessels as justification. / Source [1] says Germany cited Roosevelt-ordered attacks on German vessels as justification.

    Cites1

  24. Verified

    Japan's Pacific advance was halted at the Battle of Midway in June 1942.

    • Grok 4.7:Supported
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    Source [1] explicitly says Japan’s Pacific advances were halted at Midway in June 1942. / Source [1] says Japanese Pacific advances were halted at Midway in June 1942.

    Cites1

  25. Verified

    Operation Torch in late 1942 began a sustained US ground offensive against the European Axis.

    • Grok 4.7:Supported
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    Source [16] describes Operation Torch as initiating a US ground offensive sustained almost without pause until Axis defeat. / Source [16] says Operation Torch began a sustained US ground offensive against the European Axis.

    Cites16

  26. Verified

    The Western Allies landed in Normandy on 6 June 1944.

    • Grok 4.7:Supported
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    Source [1] dates the Western Allied invasion of northern France to 6 June 1944 and identifies Normandy elsewhere. / Source [1] says the Western Allies invaded northern France on 6 June 1944.

    Cites1

  27. Verified

    Germany surrendered unconditionally on 8 May 1945.

    • Grok 4.7:Supported
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    Source [1] explicitly dates Germany’s unconditional surrender to 8 May 1945. / Source [1] dates Germany’s unconditional surrender to 8 May 1945.

    Cites1

  28. Verified

    The US dropped atomic bombs on Hiroshima and Nagasaki on 6 and 9 August 1945.

    • Grok 4.7:Supported
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    Source [1] gives 6 and 9 August for the Hiroshima and Nagasaki atomic bombings. / Source [1] dates the Hiroshima and Nagasaki bombings to 6 and 9 August 1945.

    Cites1

  29. Verified

    Japan announced its surrender on 15 August and signed the surrender document on 2 September 1945.

    • Grok 4.7:Supported
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    Source [1] explicitly distinguishes Japan’s 15 August announcement from its 2 September 1945 signed surrender. / Source [1] dates Japan’s announced surrender to 15 August and the signed document to 2 September 1945.

    Cites1

  30. Verified

    The Germans killed over 150,000 Poles in suppressing the Warsaw Uprising.

    • Grok 4.7:Supported
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    Source [1] states Germans killed over 150,000 Poles while quelling the Warsaw Uprising. / Source [1] says German suppression of the Warsaw Uprising killed over 150,000 Poles.

    Cites1

  31. Verified

    Some 75,000 Filipino and American prisoners were forced on a death march after the capture of Bataan.

    • Grok 4.7:Supported
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    Source [1] describes approximately 75,000 Filipino and American prisoners forced onto the Bataan death march. / Source [1] says some 75,000 Filipino and American prisoners were forced on the Bataan death march.

    Cites1

  32. Verified

    16 million Americans served in uniform and more than 400,000 died.

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    Source [13] explicitly gives sixteen million Americans serving in uniform and more than 400,000 deaths. / Source [13] says 16 million Americans served and more than 400,000 died.

    Cites13

  33. Verified

    More than 1.2 million African Americans served in the US military during the war.

    • Grok 4.7:Supported
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    Source [13] states more than 1.2 million African Americans served in the military. / Source [13] says more than 1.2 million African Americans served in the military.

    Cites13

  34. Verified

    US wartime production included 296,601 aircraft, 71,060 ships and 86,388 tanks.

    • Grok 4.7:Supported
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    Source [13] gives exactly these aircraft, ship, and tank production totals. / Source [13] gives exactly 296,601 aircraft, 71,060 ships and 86,388 tanks.

    Cites13

  35. Verified

    By 1945 women made up 36 per cent of the US workforce.

    • Grok 4.7:Supported
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    Source [13] explicitly states women constituted 36 percent of the workforce by 1945. / Source [13] says women made up 36 percent of the US workforce by 1945.

    Cites13

  36. Verified

    Some 120,000 Japanese Americans were forcibly interned.

    • Grok 4.7:Supported
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    Source [7] explicitly mentions forced internment of approximately 120,000 Japanese Americans. / Source [7] refers to the forced internment of some 120,000 Japanese Americans.

    Cites7

  37. Verified

    The Office of War Information was established on 13 June 1942.

    • Grok 4.7:Supported
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    Source [11] states the Office of War Information was established by executive order on 13 June 1942. / Source [11] says the OWI was established by executive order on 13 June 1942.

    Cites11

  38. Verified

    China, France, the Soviet Union, the UK and the US became permanent members of the UN Security Council.

    • Grok 4.7:Supported
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    Source [1] identifies these five victorious powers as permanent Security Council members. / Source [1] names China, France, the Soviet Union, the UK and the US as permanent Security Council members.

    Cites1

  39. Verified

    The US and Soviet Union emerged as rival superpowers, setting the stage for the Cold War.

    • Grok 4.7:Supported
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    Sources [1] and [9] describe US–Soviet superpower rivalry leading into the Cold War. / Sources [1] and [9] say the US and Soviet Union emerged as rival superpowers before the Cold War.

    Cites19

  40. Verified

    The war accelerated decolonisation in Africa and Asia.

    • Grok 4.7:Supported
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    Sources [1] and [2] explicitly connect World War II with accelerated decolonisation in Africa and Asia. / Source [1] links the war to decolonisation in Africa and Asia; source [2] says it accelerated colonialism’s end.

    Cites12

  41. Verified

    China's government accused Taiwan of 'desecrating the martyrs' over its criticism of Beijing's World War II narrative.

    • Grok 4.7:Supported
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    Source [8] explicitly reports China’s accusation using the quoted phrase. / Source [8] reports China accused Taiwan of “desecrating the martyrs” for criticising Beijing’s WWII narrative.

    Cites8

  42. Verified

    Taiwan's Kuomintang said the government's history was correct but that it criticised Beijing for political expediency.

    • Grok 4.7:Supported
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    Source [5] explicitly reports the Kuomintang’s assessment of the government’s history and political motives. / Source [5] says the KMT accepted the government’s history but called its criticism of Beijing politically expedient.

    Cites5

  43. Verified

    Scholars said Xi Jinping's World War II account obscured the role of the Republic of China.

    • Grok 4.7:Supported
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    Source [10]’s title explicitly attributes to scholars the assessment that Xi’s account obscured the Republic of China’s role. / Source [10]’s headline says scholars found Xi’s WWII account obscured the Republic of China’s role.

    Cites10

  44. Verified

    A History News Network essay argues American popular accounts of the war follow a hero's journey pattern and omit topics such as internment and anti-Japanese racism.

    • Grok 4.7:Supported
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    Source [7] discusses the hero’s journey pattern in American accounts and criticises the featured series for omitting internment and anti-Japanese racism. / Source [7] describes American popular WWII accounts as a hero’s journey and notes omissions including internment and anti-Japanese racism.

    Cites7

Text is available under the Creative Commons Attribution-ShareAlike 4.0 licence. Written by Claude Opus 5.5 from the sources listed and checked claim by claim by GPT-6.1 Sol and Grok 4.7.