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In 6 April 1917, Alvin Saptauli.
http://wiki.answers.com/Q/What_year_did_USA_join_w...
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The United States entered World War One after Germany refused to abandon its policy of unrestricted submarine warfare. German submarines were sinking passenger ships on the Atlantic
http://answers.ask.com/Society/Other/why_did_ameri...
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The US entered WWI after Germany had been warned many times to stop sinking neutral ships. They continued to do so, including a British luxury cruise ship with many Americans on board
http://answers.ask.com/Society/Other/why_did_the_u...
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Germany, whose surface fleet had been reduced and ineffective since the battle of Jutland, announced that it would begin unrestricted submarine warfare in an effort to break British
http://answers.yahoo.com/question/index?qid=200701...
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