Why did the United States participate in World War II?

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The United States participated in World War II to protect European democracy and preserve American international power. The country viewed itself as a leader of the free world and felt that it was important to aid its allies in the fight against fascism and totalitarianism. Additionally, the attack on Pearl Harbor provoked the United States to take action and declare war on Japan and its allies. While ending the Great Depression was a secondary effect of the war, it was not the primary reason for the country's involvement. The United States did not participate in the war to become a global world power or to protect the European colonial system.

Why Did the United States Participate in World War II