How were japanese-americans treated during world war ii?

The Japanese-Americans were treated very badly.

Explanation:

Japanese internment camps were created during the war by President Roosevelt following Executive Order 9066. Any Japanese descent would be interred in an isolated camp. More than 117 thousand people were interned in those camps.

Also, there was an anti-japanese activity in the US, most of them would have their houses searched and some items were seized.