The Japanese-Americans were compelled to enter into internment camps .
The Japanese-American citizens were compelled to enter into what were essentially concentration camps for the duration of the war ~ see related link below .
They were compelled to enter into internment camps ; the same thing as a concentration camp .
The surprise Japanese attack upon Pearl Harbor .
CORE Congress of racial equality. African Americans in the military, Mexican Americans in wartime and the Japanese Americans in the War effort: Japanese American Citizens League.Read more: What_events_show_the_persistence_of_racial_tension_during_World_War_2
During WWII, Japanese-Americans were perceived as potential spies and detained until the war's end in detention camps.
Japanese-Americans .
The War changed the Americans attitude toward the Japanese because they found out after World War 2 the Japanese Americans were innocent of helping the Japanese bomb Pearl Harbor.
You might mean why were the Americans so late in entering the war; if you're referring to WWII. The Japanese were probably the first enter WWII, if one were to count fighting in China in 1933. The US didn't enter WWII until the end of 1941 (December 7, 1941).
Japanese Americans living in the U.S. and Hawaii.
They thought that the Japanese Americans might be spies.
The USA wanted to stay neutral and not go into the War at all. But the Japanese bombed Pearl Harbor. 1 day after that, the Americans declared war on Japan.