Hawaii is located in the Pacific Ocean between California and Japan.During the time of World War II, Hawaii was not a state, but a US territory.
Japanese airplanes made a surprise attack on the US Navy in Pearl Harbor.
They had tried to avoid the war, but they could not ignore this attack.
The Japanese had hoped to break the Americans by attacking Pearl Harbor, instead they united them.
However, all of the US ships but three (the Arizona, the Utah, and the Oklahoma) were able to be recovered and were used later during the war.
The biggest US loss was the sinking of the USS Arizona.