How did America enter World War 2?

America remained isolated during World War 2 for about two and a half years. They began having a bad relationship with Japan. All of a sudden on a bright morning on December, 7, 1941, planes begin crashing into Pearl Harbor(Hawaii). These were kamikazes-Japanese suicide pilots, who carried the plans out. Then on December 8, 1941, Congress declared war on Japan. The U.S. has officially entered World War 2 dealing with the conflict in Europe and Asia.