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The United States was the first country in the world (in partnership with Canada and the United Kingdom) 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. Until November 1962, the vast majority of the U.S. tests were above-ground; after the acceptance of the Partial Test Ban Treaty all testing was regulated underground, in order to prevent the dispersion of nuclear fallout. Between 1940 and 1996, the U.S. spent at least $ in present day terms on nuclear weapons development. As of February 2006, over $1.2 billion in compensation was 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 was paid to the Marshallese Islanders in compensation for their exposure to U.S. nuclear testing. The United States currently maintains an arsenal of 5,113 warheads and facilities for their construction and design, though many of the Cold War facilities have since been deactivated and are sites for environmental remediation. |