The contributing factors were Pearl Harbor bombing (December 7, 1941), fear of a Japanese take over of the Philippine's, and Guam.
The Vietnam war
Korea was the FIRST "Hot" battle of the Cold War. The "Hot" battle commenced in June of 1950.
The US did enter World War 1, though not till 1917.
The US Civil War.
The US entered the war in April of 1917 and were on the Allies side.
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The three factors that led the U.S. to enter the War was:1) Self-Determination2) The Fourteen Points3) The Western Front
The Vietnam war
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sinking of lusitania
To help out other countries
by Gerrnan submarine
by Gerrnan submarine
The Sinking of the Lusitania and the Zimmerman telegram.
Two primary factors: Germany torpedoed the Lusitania, and the 1917 Zimmerman telegram to Mexico.