From 1945 to 1992, as part of the nuclear arms race, the US conducted around 1,054 nuclear tests by official count, including 216 atmospheric, underwater and space tests. The peak occurred between 1961-62, when 340 megatons were detonated in the atmosphere by the United States and Soviet Union.
Barack Hussein Obama II, born August 4, 1961, was the 44th President of the United States and the first black US president. He served as president between January 20, 2009 to January 20, 2017. Obama was named the 2009 Nobel Peace Prize laureate in October 2009. He was succeeded by Republican Donald John Trump, who assumed office in January 2017.