Final answer:
Japanese American internment during WWII was the forced imprisonment of Japanese Americans based on assumptions of threat to national security. It was authorized by Executive Order No. 9066.
Step-by-step explanation:
Japanese American internment refers to the forced relocation and imprisonment of Japanese Americans during World War II by the US government. President Franklin D. Roosevelt issued Executive Order No. 9066, which authorized the internment, based on the assumption that these individuals posed a threat to national security. While the order did not explicitly state the reasons for targeting Japanese Americans, it was widely believed that it was due to their ethnicity and concerns of espionage.
Learn more about Japanese American internment