High Quality Content by WIKIPEDIA articles! Japanese-American internment was the relocation and internment by the United States government in 1942 of approximately 110,000 Japanese Americans and Japanese who lived along the Pacific coast of the United States to camps called "War Relocation Camps," in the wake of Imperial Japan`s attack on Pearl Harbor. The internment of Japanese Americans was applied unequally throughout the United States. Japanese Americans who lived on the West Coast of the United States were all interned, while in Hawaii, where more than 150,000 Japanese Americans composed over one-third of the territory`s population, 1,200 to 1,800 Japanese Americans were interned. Of those interned, 62% were American citizens.