Provocation from the Japanese. Larger historical forces eventually brought the United States to the brink of World War II, but the direct and immediate cause that led it to officially entering the war was the Japanese attack on Pearl Harbor
> The Japanese attack on the US naval base in Pearl Harbor, Hawaii, led President Franklin Roosevelt to declare war on Japan. A few days later, Nazi Germany declared war on the United States, and America entered World War II against the Axis powers
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