The U.S. entered World War I in 1917. This was very late in the war and America didn't have much of a chance to do anything very significant. However the entrance of the U.S. in the war was justified. Three of most significant reasons the U.S. entered the war for were all successfully completed. The reasons were the Zimmerman Note, to stop the U-Boats, and help France and Britain defeat the Central Powers. The U.S, and the Allied Powers successfully did all three of these things.

The Zimmerman Note was a telegram between Japan, Germany, and Mexico promising Mexico the land it lost to America during the Mexican-American war, if they joined Japan and Germany in an invasion on the U.S. The land they'd gain would be Arizona, Texas, and New Mexico. This scared and angered most Americans. They were

afraid of losing land they rightfully own and won. Americans also didn't want to be invaded by three other countries and lose many, many American lives (WWI The Great War). In the sense of preventing the plans contained in the Zimmerman Note the U.S.'s entrance into the war was justified because the plans were never carried out, due to the entrance of the U.S. and the defeat of Germany making the plan impossible to carry out (WWI An Outline History).

The German U-boats were a major danger to the U.S. and other allied countries especially Britain. The subs prevented supplies and troops from reaching Europe. This would eventually starve Britain to death. The U-boats also sunk American and British ships killing many Americans, among others. The U.S. and Allies developed a system of getting ships to Europe without getting harmed by German U-boats. This system was c

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Approximate Word count = 585
Approximate Pages = 2 (250 words per page double spaced)