Answer
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Step 1:I'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.
Step 3:: Immediate Aftermath of Pearl Harbor
On December 8, 1941, President Franklin D. Roosevelt delivered his famous "Day of Infamy" speech to Congress, requesting a declaration of war against Japan. Congress immediately approved the declaration with only one dissenting vote.
Step 4:: Expanding the Conflict
On December 11, 1941, Germany and Italy (as allies of Japan) declared war on the United States, which then prompted the U. S. to declare war on these Axis powers, fully entering World War II on multiple fronts.
Step 5:: Context of U.
S. Entry Prior to Pearl Harbor, the United States had maintained a policy of neutrality, providing material support to Allied nations through programs like Lend-Lease, but avoiding direct military involvement.
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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