On 1 September 1939, as Germany occupied Poland, World War II began in Europe. On 3 September, Great Britain and France replied by declaring war against Germany. On 22 June 1941, with the German invasion of the Soviet Union, a war between the USA and Germany began.
Explanation:
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World War II began in Europe on September 1, 1939, when Germany invaded Poland. Great Britain and France responded by declaring war on Germany on September 3. The war between the U.S.S.R. and Germany began on June 22, 1941, with the German invasion of the Soviet Union.
