United States and weapons of mass destruction
The United States is known to have possessed three types of weapons of mass destruction: nuclear, chemical, and biological 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. It had secretly developed the earliest form of the atomic weapon during the 1940s under the title "Manhattan Project". The United States pioneered the development of both the nuclear fission and hydrogen bombs. It was the world's first and only nuclear power for four years, from 1945 until 1949, when the Soviet Union produced its own nuclear weapon. The United States has the second-largest number of nuclear weapons in the world, after the Russian Federation.
A Minuteman III ICBM test launch.
B-2 Spirit stealth strategic bomber.
USS Kentucky (SSBN-737), an Ohio-class ballistic missile submarine.
Honest John missile warhead cutaway, showing M134 Sarin bomblets (photo c. 1960)
Weapon of mass destruction
A weapon of mass destruction (WMD) is a biological, chemical, radiological, nuclear, or any other weapon that can kill or significantly harm many people or cause great damage to artificial structures, natural structures, or the biosphere. The scope and usage of the term has evolved and been disputed, often signifying more politically than technically. Originally coined in reference to aerial bombing with chemical explosives during World War II, it has later come to refer to large-scale weaponry of warfare-related technologies, such as biological, chemical, radiological, or nuclear warfare.
Protest in Amsterdam against the deployment of Pershing II missiles in Europe, 1981
An atomic-bomb blueprint
Anti-nuclear weapons protest march in Oxford, 1980