Question

The United States became directly involved in World War II following A) Germany's attack on Britain. B) the German invasion of Poland. C) Japan's attack on Pearl Harbor. D) the sinking of the Lusitania.

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Answer 1

The United States became directly involved in World War II following Japan’s attack on the Pearl Harbor.

In 1939 USA clearly stated that would be neutral to the WWII yet they began supplying military arms and weapons to the allies in 1940.

Finally it was in December 1941 they entered the war. But when Japanese attacked the naval base of the US in Pearl Harbor on December 7, 1941, US immediately came into attack.