The Teller-Ulam design is a nuclear weapon design that is used in the range of thermonuclear weapons, and which is referred to in a familiar way as "the secret of the hydrogen bomb." Its name comes from the two main contributors, the Hungarian-American physicist Edward Teller and the Polish-American mathematician Stanisław Ulam, who developed the design in 1951. The basic idea is the use of a fission atomic bomb as a trigger placed close to a quantity of fusion fuel, and the use of "radiation implosion" to compress the fusion fuel and get it on.
The result of the development of this weapon, was a rapid arms race between the powers of the world during the Cold War. you loved powers, they wanted to develop weapons of mass destruction that allowed them to impose their ideas and forms of government.