(A) The United States had suffered economically from European sanctions
(B) ** A European nation had taken aggressive actions against the United States
(C) The U.S. president was obligated to fulfill campaign promises
(D) Communist activities among U.S. immigrants were threatening the country
EXPLANATIONS BELOW
Concept note-1: -Germany’s resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation behind Wilson’s decision to lead the United States into World War I.