Japanese Americans

are Americans who are fully or partially of Japanese descent, especially those who identify with that ancestry and its cultural characteristics. 
Statistics.
Japanese Americans were among the three largest Asian American ethnic communities during the 20th century; but, according to the 2000 census, they have declined in number to constitute the sixth largest Asian American group at around 773,000, including those of partial ancestry. According to the 2010 census, the largest Japanese American communities were found in California with 272,528, Hawaii with 185,502, New York with 37,780, Washington with 35,008, Illinois with 17,542, and Ohio with 16,995. Southern California has the largest Japanese American population in North America. The city of Gardena holds the densest Japanese American population in the 48 contiguous states.
Internment camps.
During World War II, Japanese Americans were forced to leave their homes and move to internment camps.