Excuse me, war had been declared after Japanese bombed Pearl Harbor.
Some Italians also went to internment camps because Italy had been declared a Nazi country by Mussolini, the Italian leader. It was just a bit ridiculous considering Fiorello LaGuardia was Mayor of NYC at the time and many Italians were in the US armed services. On October 12, 1942, less than a year later, U.S. Attorney General Francis Biddle declared that Italians were no longer enemies of the state. Interesting account here:
https://www.history.com/news/italian-american-internment-persecution-wwii
Great info. Thanks.