The causes of World War II
World War II had two main theaters that eventually merged into one global conflict: in Europe, Germany's invasion of Poland on September 1, 1939, prompted Britain and France to declare war, following years of German expansion that other powers had largely tolerated through a policy of appeasement. In Asia, Japan had already been at war with China since 1937 and continued expanding across East and Southeast Asia, bringing the United States into the war after Japan's attack on Pearl Harbor in December 1941.
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