America did not want to enter WWI, but actions made by Germany forced them to enter the war. The United States had taken up a policy of isolationism. This means that they would not get involved in foreign affairs unless they were attacked or provoked. This had been working for them up until mid-WWI, but the steps leading up to involvement are just as important as what happened in the war. There were five major events that caused America to enter into the first world war, and no event was worse than the other.