Japan’s Emperor Hirohito announced his country’s unconditional surrender in World War II in a radio address on August 15, citing the devastating power of “a new and most cruel bomb.” The Manhattan ProjectĮven before the outbreak of war in 1939, a group of American scientists-many of them refugees from fascist regimes in Europe-became concerned with nuclear weapons research being conducted in Nazi Germany. Three days later, a second B-29 dropped another A-bomb on Nagasaki, killing an estimated 40,000 people. The explosion immediately killed an estimated 80,000 people tens of thousands more would later die of radiation exposure. ![]() ![]() On August 6, 1945, during World War II (1939-45), an American B-29 bomber dropped the world’s first deployed atomic bomb over the Japanese city of Hiroshima.
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