From 1937 to 1939, US President Franklin D. Roosevelt was a vocal opponent of the Japanese and Nazi attacks against allied nations. Despite his opponents, FDR insisted that the United States will stay neutral in the war, which undermined his role with his allies.

The attack on Pearl Harbor, December 6th, 1941

Explanation:

For the longest time, the U.S wanted to remain out of the war, but we did sell weapons to other countries for help. But due to Japan invading Pearl Harbor out of nowhere, FDR made the decision to declare war on Japan. This brought the United States into the war completely.

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