Why did the enemy aliens occur in World War 2?

During World War II, the term "enemy aliens" referred to individuals living in a country who were citizens of nations that were at war with that country. In the United States, for instance, many Japanese, German, and Italian immigrants were classified as enemy aliens, leading to suspicion and fear of espionage or sabotage. This resulted in widespread discrimination, internment, and restrictions on their civil liberties, particularly for Japanese Americans. The government justified these actions as necessary for national security during a time of conflict.