The event that drew the United States fully into World War II was the

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The Japanese attack on Pearl Harbor on December 7, 1941, was the event that drew the United States fully into World War II. Prior to this attack, the U.S. had been providing aid to Allied forces, but had not officially declared war on the Axis powers. After the attack, President Roosevelt declared war on Japan, and subsequently on Germany and Italy, who were Japan's allies.

The Event That Drew the United States Fully into World