Why were internment camps established in the United States?
a. to isolate people protesting the war
b. to provide homes for temporary farm workers
c. to train workers in new industrial skills
d. to isolate people believed to be threats
D. To isolate people who were believed to be threats.
America used these camps after the bombings of Pearl Harbor. They believed that Japanese were a threat to the country, so they has them put in internment camps.
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 The United States made use of internment camps for fear the involvement of immigrants to their home countries - mainly Japan, who had just attacked Pearl Harbor.
