How did US involvement in World War II change over the course of the war?
A) United States sold supplies to nations on both sides of the war until German submarine sank it’s ships
B) the United States refused to help nations on either side of the war until the Japanese attack on Pearl Harbor
C) the United States started as neutral, then began supplying allied forces, and then begin fighting on the allied side
D) the United States started as neutral, then declared war on the axis powers, then began supplying the allied forces