Which action caused the United States to enter World War 1? A. Germany offered safety to Pancho Villa
B. Germany used airplanes to attack American naval ships
C. Germany sank ships carrying American passengers
D. Germany attacked France

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C. Germany sink ships carrying American passengers.

Do United States later declared war on Germany ally Austria Hungary on December 7, 1917 Germany’s resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation behind the Wilson’s decision to lead to the United States into World War I.