Why the Japanese invade U.S. mainland?

There is no historical record of the Japanese invading the U.S. mainland during the Second World War or at any other time in history. While there were several major battles between the U.S. and Japanese forces during the war, these battles were primarily confined to the Pacific theater, taking place in locations such as the Philippines, Guam, and various Pacific islands. The Japanese did conduct air raids on the U.S. mainland, such as the attack on Pearl Harbor in Hawaii in December 1941, but there was no invasion or attempted invasion of the mainland itself.