What happen to the Japanese - Americans during World War 2?

Due to fears of spying and sabotage, there was a general relocation and internment of approximately 110,000 Japanese nationals and Japanese-Americans to housing facilities called "War Relocation Camps." Those living in militarily important areas of the Pacific coast were removed from their homes and placed in the large, guarded camps in remote desert areas. While not overtly mistreated, most internees suffered from inadequate facilities, shortages of food, and limited medical care.

Despite this, some eligible internees join the American military. Many joined the 442nd Infantry Regiment, a highly decorated unit of Japanese-American soldiers.

After three years of mostly negative court decisions, the US Supreme Court declared that the involuntary detention was unconstitutional, and the citizens were released from the camps, most by mid-1945 as the war with Japan neared its end.