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World War I lasted from July 28, 1914 to November, 11, 1918 (armistice).

The US did not declare war on Germany until April 6, 1917.

World War II can be considered to have begun with the Japanese invasion of China (Second Sino-Japanese War) on July 7, 1937. In Europe, France and Britain declared war on Germany on September 3, 1939 after Germany invaded Poland on September 1. But the aggression by Germany was preceded by the 1938 Anschluss (forced Austrian entry) and the March 1939 occupation of Czechoslovakia. The US declared war on Japan on December 8, 1941 following Pearl Harbor, and Germany declared war on the US on December 11.

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Q: When did world war 1 and 2 take place?
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