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Nuclear weapons and the United States
The United States was the first country to develop nuclear weapons, and is the only country to have used them in warfare, with the separate bombings of Hiroshima and Nagasaki in World War II. Before and during the Cold War, it conducted over a thousand nuclear tests and developed many long-range weapon delivery systems.
Between 1940 and 1996, the U.S. spent at least $ in present-day terms on nuclear weapons development, including platforms development (aircraft, rockets and facilities), command and control, maintenance, waste management and administrative costs.〔(【引用サイトリンク】Brookings Institution ">title=Estimated Minimum Incurred Costs of U.S. Nuclear Weapons Programs, 1940-1996 )〕 It is estimated that, since 1945, the United States produced more than 70,000 nuclear warheads, which is more than all other nuclear weapon states combined. The Soviet Union/Russia has built approximately 55,000 nuclear warheads since 1949, France built 1110 warheads since 1960, the United Kingdom built 835 warheads since 1952, China built about 600 warheads since 1964, and other nuclear powers built fewer than 500 warheads all together since they developed their first nuclear weapons. Until November 1962, the vast majority of U.S. nuclear tests were aboveground. After the acceptance of the Partial Test Ban Treaty, all testing was relegated underground, in order to prevent the dispersion of nuclear fallout.
By February 2006 over $1.2 billion in compensation had been paid to U.S. citizens exposed to nuclear hazards as a result of the U.S. nuclear weapons program, and by 1998 at least $759 million had been paid to the Marshall Islanders in compensation for their exposure to U.S. nuclear testing.〔〔 – updated regularly〕
In 2015, the United States maintained an arsenal of 4,760 warheads〔http://www.sipri.org/research/armaments/nuclear-forces/the-united-states〕 and facilities for their construction and design, though many of the Cold War facilities have since been deactivated and are sites for environmental remediation.
==Development history==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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