6 Aug, 1945 Nuclear Bomb Hiroshima
1945 : An atomic bomb was used containing more power than 12,000 tons of TNT and producing more than 2,000 times the blast of the most powerful bomb ever dropped before was dropped on the city of Hiroshima, killing an estimated 140,000 people in the first use of a nuclear weapon in warfare. The bomb nicknamed "Little Boy" with 130 pounds of uranium-235 produced the equivalent to about 13 kilotons of TNT. On August 9, 1945, America dropped the second Atom bomb on Nagasaki effectively ending the war when Japan announced their surrender.