Although World War I began in 1914, the United States did not join the war until 1917. ... The additional firepower, resources, and soldiers of the U.S. helped to tip the balance of the war in favor of the Allies. Remaining Neutral. When war broke out in 1914, the United States had a policy of neutrality.
I think your answer should be either the third choice or second choice. They both make sense to me but the other two are definitely not it. Hope this helps! =^-^=
