During the 1970s, relations between the US and USSR improved through a policy of détente, with both sides taking steps to reduce nuclear weapons and the risk of war. Key events included Nixon's visit to China and Moscow in 1972, the SALT I agreement that limited nuclear weapons, and the Helsinki Accords in 1975 that established agreements on borders and human rights. However, détente ended in the late 1970s due to the Soviet invasion of Afghanistan in 1979.
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