Causes and Effects of WWII
Five main events caused the U.S. to join the war
Cash and Carry Policy
A policy requested by FDR where companies in the United States had the ability sell war materials if paid cash in full. The purchaser would then pick up the items and transport them. This took Germany out of the process because Germany didn't have any major ships, they just had submarines for the most part.
After all this. it took the attack on pearl harbor by the Japanese. The Japanese started taking over large amounts of areas in the east, like China and Manchuria. The United States didnt like this idea so we restricted their trade and "froze" their bank assets. This really made Japan mad so they created a surprise attack on Pearl Harbor. 2,403 Americans were killed and 1,178 others were wounded in this attack.