Final answer:
After Pearl Harbor, prejudice against Japanese Americans led to their forced internment ordered by Executive Order 9066, impacting around 120,000 individuals, primarily for unfounded national security reasons.
Step-by-step explanation:
After the Pearl Harbor attack, American prejudice intensified against people of Japanese ancestry. Fueled by fear and racial biases, the U.S. government signed Executive Order 9066, leading to the forced relocation and internment of about 120,000 Japanese Americans, the majority of whom were U.S. citizens. They were taken to internment camps in remote areas of the American interior for the duration of World War II, justified by government officials as a necessary security measure against espionage and sabotage, despite evidence to the contrary.