By order of the US government (FDR's Executive Orders 9066 and 9102), they were relocated by law enforcement and military authorities, and guarded by the US Army.
Canada pursued a similar policy, to the extent of classifying Japanese-Canadians as enemy aliens, and removing almost all of them from British Columbia.
See website: Japanese-American internment
The Japanese
See: Japanese American internment
See website: Japanese-American internment camps.
See website: Japanese-American internment
See website: Japanese-American internment camps.
See: Japanese American internment camps
They were interned in internment camps.
Japanese American property losses during their wartime internment.
No it was not - they were American citizens who had done nothing wrong. They were not fighting on the Japanese side during the war. The internment was caused by fear and racism.
See: Japanese American internment
See website: Japanese-American internment