Ten weeks after the Japanese bombed Pearl Harbor, U.S. President Franklin D. Roosevelt signs Executive Order 9066, authorizing the removal of any or all people from military areas "as deemed necessary or desirable." The military in turn defined the entire West Coast, home to the majority of Americans of Japanese ancestry or citizenship, as a military area. By June, more than 110,000 Japanese Americans were relocated to remote internment camps built by the U.S. military in scattered locations around the country. For the next two and a half years, many of these Japanese Americans endured extremely difficult living conditions and poor treatment by their military guards.

On December 17, 1944, U.S. Major General Henry C. Pratt issued Public Proclamation No. 21, declaring that, effective January 2, 1945, Japanese-American "evacuees" from the West Coast could return to their homes. During the course of World War II, 10 Americans were convicted of spying for Japan, but not one of them was of Japanese ancestry. In 1988, President Ronald Reagan signed a bill to recompense each surviving internee with a tax-free check for $20,000 and an apology from the U.S. government.