On August 6, 1945, the Enola Gay, a U.S. B-29 bomber, drops the first atomic bomb used on people over the Japanese city of Hiroshima. Between the blast and the extended fallout, the disaster killed over 140,000 people. U.S. President Harry S. Truman made the decision to use the bomb rather than invade Japan to end World War II. Watch a segment about Hiroshima from the film Truman. (originally aired in 1997.)