1942-1953 By BrodieWolfie 1942 Roosevelt's Reelections He served four terms in office because of World War II. Apr 12, 1945 Truman steps into office After Roosevelt suffered a stroke. May 7, 1945 Germany Surrenders World War II Aug 6, 1945 Hiroshima, Japan is bombed by the U.S. Aug 9, 1945 Nagasaki, Japan is bombed by the U.S. Jun 23, 1948 Soviet Union begins blockade of West Berlin Aug 29, 1949 Soviet Union detonates their first Atomic Bomb Jun 25, 1950 North Korea invades South Korea The Korean War begins. Oct 9, 1950 Truman approves expansion to produce Uranium and Plutonium for Nuclear Weapons 1952 Election of Dwight D. Eisenhower