From to , it was the policy of the U. Enacted in reaction to Pearl Harbor and the ensuing war, the Japanese internment camps are now considered one of the most atrocious violations of American civil rights in the 20th century. Roosevelt signed Executive Order with the intention of preventing espionage on American shores. Executive Order affected the lives about , people—the majority of whom were American citizens.
Japanese American | people | Britannica
Japanese Americans were among the three largest Asian American ethnic communities during the 20th century; but, according to the census , they have declined in number to constitute the sixth largest Asian American group at around ,, including those of partial ancestry. People from Japan began migrating to the US in significant numbers following the political, cultural, and social changes stemming from the Meiji Restoration in These early Issei immigrants came primarily from small towns and rural areas in the southern Japanese prefectures of Hiroshima , Yamaguchi , Kumamoto , and Fukuoka  and most of them settled in either Hawaii or along the West Coast. The Japanese population in the United States grew from in mostly students to 2, in and 24, by
At the time of the Japanese attack on Pearl Harbor in , about , persons of Japanese ancestry lived on the US mainland, mostly along the Pacific Coast. About two thirds were full citizens, born and raised in the United States. Following the Pearl Harbor attack, however, a wave of antiJapanese suspicion and fear led the Roosevelt administration to adopt a drastic policy toward these residents, alien and citizen alike. Virtually all Japanese Americans were forced to leave their homes and property and live in camps for most of the war.
In the law barred further entries; those already in the United States had been ineligible for citizenship since the previous year. In thousands of Japanese, many born in the United States and therefore American citizens, were…. Some three-fifths of them were American-born citizens known as Nisei second-born ; most of the others were Issei, older adults who had immigrated before Congress halted their influx in Japanese agitation, focused largely in San Francisco, affected domestic and international policies.