1945
July 16, 1945 was the first nuclear bomb test by the United States.
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Tthe last hydrogen bomb was set of 1991 under the Nevada desert.
1949, it was a clone of the US Fatman design based on stolen plans.
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To end WWII.
1945
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Yes, an underground nuclear bomb test has the potential to create seismic waves that can be detected and recorded as an earthquake. The magnitude of the seismic event would depend on the yield of the nuclear explosion and the geology of the surrounding area.
The US nuclear program in WWII was codenamed the Manhattan Project due to the location much of the early work was done.The 1st test of a nuclear device was codenamed the Trinity Test. The bomb itself was called "The Gadget"The 1st bomb used against Japan in Hiroshima was codenamed "Little Boy"The 2nd bomb used against Japan in Nagasaki was codenamed "Fat Man"
The nuclear attack on Hiroshima and Nagasaki, were the last attack in World War Two. After that Japan surrendered. It also brought us into the nuclear age.