This Cold War enemy of the United States "collapsed" in 1991 after years of economic and political turmoil

The Soviet union was the Cold War enemy of the United States that collapsed in 1991 after years of economic and political turmoil.

Explanation:

The process of the degradation of the Soviet union had begun in 1985 itself as a result of the increasing unrest among the national republics. With the implementation of Belavezha Accords, the republics that were formerly a part of the USSR were granted independence in order to allow them to function as independent nations. The dissolution of the USSR was a result of years of political conflicts and economic downgrading of the Soviet union.