The Pearl harbor attack had an immense impact on the United States because it was the most salient reason why the U.S. joined the war. On December 7, 1941, the Japanese army attacked the United States in Pearl Harbor, Hawaii with air crafts.The Japanese army attacked Pearl Harbor in two waves that ultimately lasted about two hours. The attack was brief but they managed to kill 2,000 American soldiers and destroy nearly 20 naval vessels and 200 planes. The attack seemed to be America’s last straw since they had never been attacked in their own territory. The day after the massive assailment president Franklin D. Roosevelt asked congress to declare war on Japan and congress approved. Later on, Japan’s allies also wanted in on the war with the