How did WWI contribute to the boom in America?

During the first two and a half years of combat, the United States was a neutral party and the economic boom came primarily from exports. The total value of U.S. exports grew from $2.4 billion in 1913 to $6.2 billion in 1917

answer; /// i believe the correct answer is flash your high beams at them.or tap your horn;

answer; (i-o) psychologist