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The causes of World War II depend on the time range that applies. ... The trigger for the conflict was the declaration of war from the United Kingdom and France to Nazi Germany on September 3, 1939, after the German invasion of Poland on September 1 of that year.
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The main countries that participated in World War II were those that formed "the Axis" (Germany, Italy and Japan) and the so-called "Allies" (United Kingdom, the Soviet Union, China and the United States).
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World War II began on September 1, 1939
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The counting of the victims of the Second World War has been the subject of numerous studies, which normally offer estimates of between 55 and 60 million people killed, rising to more than 100 million according to the most pessimistic calculations2 and from 40 to 45 million according to The most optimistic.
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After the atomic bombing of Hiroshima and Nagasaki by the United States and the Soviet invasion of Manchuria, the war in Asia ended on August 15, 1945 when Japan accepted unconditional surrender.
