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The United States is known to have possessed three types of weapons of mass destruction: nuclear, chemical, and biological weapons.As the country that invented nuclear weapons, the U.S. is the only country to have used nuclear weapons on another country, when it detonated two atomic bombs over two Japanese cities of Hiroshima and Nagasaki during World War II.
The Fat Man mushroom cloud resulting from the nuclear explosion over Nagasaki rises into the air from the hypocenter.. Substantial debate exists over the ethical, legal, and military aspects of the atomic bombings of Hiroshima and Nagasaki on 6 August and 9 August 1945 respectively at the close of the Pacific War theater of World War II (1939–45).
The discovery of nuclear fission in 1938 made the development of an atomic bomb a theoretical possibility. [52] Fears that a German atomic bomb project would develop atomic weapons first, especially among scientists who were refugees from Nazi Germany and other fascist countries, were expressed in the Einstein–Szilard letter to Roosevelt in 1939.
It’s been 75 years since the U.S. dropped an atomic bomb on the Japanese city of Hiroshima — marking the end of World War II and the dawn of the nuclear age — but survivors like Masaaki ...
The Castle Bravo fallout plume spread dangerous levels of radioactive material over an area over 100 miles (160 km) long, including inhabited islands, in the largest single U.S. nuclear accident. The United States nuclear program since its inception has experienced accidents of varying forms, ranging from single-casualty research experiments ...
The atomic bomb dropped by the United States on Hiroshima on Aug. 6, 1945, destroyed the city, killing 140,000 people. A second bomb dropped three days later on Nagasaki killed 70,000 more.
On August 6, 1945, the US dropped an atomic bomb on Hiroshima -- and newly revealed photos shed light on the preparations for the attack. On August 6, 1945, the US dropped an atomic bomb on ...
Trinity, part of the Manhattan Project, was the first ever nuclear explosion. The United States performed nuclear weapons tests from 1945 to 1992 as part of the nuclear arms race. By official count, there were 1,054 nuclear tests conducted, including 215 atmospheric and underwater tests. [1] [notes 1]