Who was the leader of the Soviet Union in the 1980's?

Explanation:

Mikhail Sergeyevich Gorbachev (born 2 March 1931) is a Russian and former Soviet politician. The eighth and last leader of the Soviet Union, he was the General Secretary of the Communist Party of the Soviet Union from 1985 until 1991.

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Konstantin Chernenko

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After the death of Brezhnev and his successor Yuri Andropov, Chernenko was elected General Secretary in February 1984 and made Chairman of the Presidium of the Supreme Soviet in April 1984. Due to his rapidly failing health, he was often unable to fulfill his official duties.

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answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;