Final answer:
Japanese Americans were interned during World War II due to racial prejudice, war hysteria, and a failure of political leadership.
Step-by-step explanation:
The reason given for the internment of Japanese Americans during World War II was a combination of racial prejudice, war hysteria, and a failure of political leadership. The attack on Pearl Harbor by the Japanese government led to a surge of anti-Japanese sentiment in the United States, resulting in the relocation and internment of over 110,000 Japanese and Japanese-American individuals. Although there was little evidence of disloyalty on the part of Japanese Americans, they were unfairly targeted based on their ethnicity.