This suspicion was fed by long-standing racism against Japanese immigrants, as well as the findings of the Roberts Commission, which concluded that the attack on Pearl Harbor had been assisted by Japanese spies. On February 19, 1942, President Roosevelt signed Executive Order 9066, which relocated 110,000 Japanese-American citizens and immigrants, most of whom lived on the Pacific Coast.[159] They were forced to liquidate their properties and businesses and interned in hastily built camps in interior, harsh locations. Distracted by other issues, Roosevelt had delegated the decision for internment to Secretary of War Stimson, who in turn relied on the judgment of Assistant Secretary of War John J. McCloy. The Supreme Court upheld the constitutionality of the executive order in the 1944 case of Korematsu v. United States.[349] Many German and Italian citizens were also arrested or placed into internment camps.[350]

Jews
There is controversy among historians about Roosevelt's attitude to Jews and the Holocaust. Arthur M. Schlesinger Jr. says Roosevelt "did what he could do" to help Jews; David Wyman says Roosevelt's record on Jewish refugees and their rescue is "very poor" and one of the worst failures of his presidency.