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With Cold War tensions heightening at the start of the 1960s, the superpowers are drawn into an escalating arms race. The world's safety depends on a nuclear paradox known as "mutual assured destruction."
It was a conflict that devastated one nation and divided another. Vietnam brought a new dimension to the Cold War -- and forced the United States to rethink its goals in the superpower rivalry.
In the 1960s the United States claimed its place as the world's leading defender against communism. But by the end of the decade, the nation was convulsed by dissent, riot, assassination and an increasingly unpopular war.