What action did Roosevelt use to create the internment?

President Franklin D. Roosevelt used Executive Order 9066, signed on February 19, 1942, to authorize the internment of Japanese Americans during World War II. This order allowed for the forced relocation and incarceration of around 120,000 individuals, primarily from the West Coast, based on the premise of national security amid wartime fears. The decision was largely driven by racial prejudice and wartime hysteria rather than any proven threat from the Japanese American community.