Heart Mountain Confinement Camp. From 1942-1945. The Roosevelt administration felt the the Japanese-American citizenry of the Western coastal states were an immediate threat to the security of the United States after the attack on Pearl Harbor. In order to remove the threat, the President came up with Executive Order 9066, which allowed authorities to remove Japanese-Americans to be imprisoned at various locations in the interior of the United States. This collection comes from a previous LCCC Ludden Library display.