How did the U.S government treat people of German, Italian, and Japanese ancestry.
WW2

The incarceration of Japanese-Americans is the best-known effect of Executive Order 9066, the rule signed by President Franklin Roosevelt on February 19, 1942. And for good reason. The suffering and punishment placed upon innocent Japanese-Americans was a dark chapter in American history. But the full extent of the government order is largely unknown.

Explanation:

The executive order that forced Japanese-Americans from their homes also put immigrants from Italy under the watchful eye of the government