Answer
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Step 1I'll solve this historical problem following the specified formatting guidelines:
Step 2: Identify the Trigger Event
The United States entered World War II on December 7, 1941, following the surprise Japanese attack on Pearl Harbor, Hawaii. This devastating military strike on the U. S. Pacific Fleet dramatically changed American foreign policy.
Final Answer
The United States officially entered World War II on December 7 - 8, 1941, following the Japanese attack on Pearl Harbor, with formal declarations of war against Japan, Germany, and Italy occurring between December 8 - 11, 1941.
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