What year did Japanese Americans relocate?

It took place during the spring and summer of 1942 after the Japanese attack on Pearl Harbor. The United States Government moved of 110,000 people of Japanese descent (both American-born and alien Japanese) from their homes in an area bordering the Pacific coast into 10 wartime communities constructed in remote areas between the Sierra Nevada Mountains and the Mississippi River, called "War Relocation Camps". At the time, the invasion of the West Coast by Japan seemed a possibility. The Western Defense Command of the United States Army decided that the military situation required this.