<P> Eventually, on October 28, through much discussion between U.S and Soviet officials, Khrushchev announced that the Soviet Union would withdraw all missiles from Cuba . Shortly after, the U.S. withdrew all their nuclear missiles from Turkey in secret, which had threatened the Soviets . The U.S.'s withdrawal of their Jupiter Missiles from Turkey was kept private for decades after, causing the negotiations between the two nations to appear to the world as a major U.S. victory . This ultimately led to the downfall of Premier Khrushchev . </P> <P> By the 1970s, with the cold war entering its 30th year with no direct conflict between the superpowers, the United States and the Soviet Union entered a period of reduced conflict, in which the two powers engaged in trade and exchanges with each other . This period known as détente . This period included negotiation of a number of arms control agreements, building with the Nuclear Test Ban Treaty in the 1950s, but with significant new treaties negotiated in the 1970s . These treaties were only partially successful . Although both states continued to hold massive numbers of nuclear weapons and research more effective technology, the growth in number of warheads was first limited, and later, with the START I, reversed . </P> <P> In 1958, both the U.S. and Soviet Union agreed to informally suspend nuclear testing . However, this agreement was ended when the Soviets resumed testing in 1961, followed by a series of nuclear tests conducted by the U.S. These events led to much political fallout, as well as the Cuban Missile Crisis in 1962 . Something had to be done to ease the great tensions between these two countries, so on October 10, 1963, the Limited Test Ban Treaty (LTBT) was signed . This was an agreement between the U.S., the Soviet Union, and the U.K., which significantly restricted nuclear testing . All atmospheric, underwater, and outer space nuclear testing were agreed to be halted, but testing was still allowed underground . An additional 113 countries have signed this treaty since 1963 . </P> <P> SALT I and SALT II limited the size of the states' arsenals . Bans on nuclear testing, anti-ballistic missile systems, and weapons in space all attempted to limit the expansion of the arms race through the Partial Test Ban Treaty . </P>

How many nukes did america have during the cold war