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A. The war was in Europe, not in the United States - The United States tried to stay out of World War I at first because the war was being fought in Europe and they did not believe that it directly threatened their national security or interests.
B. The U.S. economy boomed because of increase in military supply orders and increase in trade - The United States became an important supplier of war materiel to the Allied Powers and was able to take advantage of increased demand for American goods, leading to economic growth and increased profits for American businesses.