Truman, a self-educated farm boy from Missouri, stood in sharp contrast to the urbane and imperious Roosevelt who kept personal control of all major decisions. Truman was a folksy, unassuming president who relied on his cabinet, remarking "The buck stops here" and "If you can't stand the heat, you better get out of the kitchen." Truman faced many challenges in domestic affairs. His poll ratings were sky high when he took office in April 1945 after Roosevelt's sudden death, then plunged to low levels for most of his eight years in office. The disorderly postwar reconversion of the economy of the United States was marked by severe shortages of housing, meat, appliance, automobiles and other rationed goods. The country was hit by long strikes in major industries in 1946, and Truman's unpopularity was such that the GOP regained Congress in a landslide during the midterms that year, and proceeded to pass the Taft–Hartley Act over his veto. He used executive orders to end racial discrimination in the armed forces and created loyalty checks that dismissed thousands of communist fellow travelers from office. Truman's presidency was also eventful in foreign affairs, with the defeat of Nazi Germany and his decision to use nuclear weapons against Japan, the founding of the United Nations, the Marshall Plan of 1948 to rebuild Europe, the Truman Doctrine of 1947 to contain communism, the beginning of the Cold War, the Berlin Airlift of 1948, and in 1949 the creation of the North Atlantic Treaty Organization (NATO) military alliance.