What are the reasons for the policy of Japanese internment camps in the United States?

The Japanese government was so deceitful in the way they set up the U.S. for the Pearl Harbor bombing that it was difficult for the country to trust Japanese immigrants. Japanese diplomats were in the middle of peace talks and giving assurances that they had no intention of taking over Hawaii when they bombed Pearl Harbor in 1941. The U.S. had been suspicious before then since Japanese troops had taken several other Pacific Islands, but Japan was very convincing in their efforts to assure U.S. politicians that there would be no attack.

On Sunday morning, December 7, 1941, when the nation was told that Pearl Harbor was being bombed, there was an immediate suspicion of everyone who looked Japanese, much as there is now suspicion of anyone who looks Middle Eastern. Only back then there was no effort to convince people that not all Orientals were trying to kill Americans.

It was a different, less enlightened time.

The belief was that if the nation could keep the Japanese away from anything critical to the nation, we wouldn't have to worry about what they would do if they were lying to us as the Japanese Government had done.