Answer: The policy was enacted under the guise of protecting the country. Japanese-Americans were relocated from the West Coast to the interior in an effort to prevent anti-American war activities like espionage and sabotage. Basically they were attacked!
Not sure which film you're referring to, but from what I can gather from the question that was the reason Japanese Americans were forced to relocate in the first place, due to old racist dudes running the country and thinking it was a top tier idea
The earliest civilizations developed between 4000 and 3000 BCE, when the rise of agriculture and trade allowed people to have surplus food and economic stability.