My mother-in-law and father-in-law, Japanese Americans, were both interned at Topaz, Utah during the war.
The explanation was that it was for THEIR protection and to prevent possible sabotage on the West Coast.
The vast majority of the more than 100,000 who were imprisoned were American citizens whose rights were violated, and who were paid $20,000 in reparations in 1986 by the United States government.
Also, a SMALL number of Italian and German foreign nationals WERE interned on New York during the war.
P.S. MANY Japanese Americans volunteered to join the 442nd Regimental Combat Team. They fought in Euorpe, and they were the most highly decorated combat unit in WWII.
FACT. CHECK IT. "GO FOR BROKE!"