C) The day Japan bombed Pearl Harbor
Japan bombed Pearl Harbor, Hawaii during World War II.  It was the largest attack on American soil to date, and it was viewed as an act of war.  It directly led to the U.S. entering into World War II.  
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i believe that the answer is A
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Wilson believed that having distinct and separate American combat units would guarantee the US a major role in the peace talks at the end of the war