Mikhail gorbachev lead the soviet union into a new era of reforms called

perestroika

explanation:

perestroika was a political movement for reformation within the communist party of the soviet union during the 1980s and 1990s and is widely associated with soviet leader mikhail gorbachev and his glasnost policy reform. perestroika refers to the reconstruction of the political and economic system established by the communist party.

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d) the constitution rights of native americans and their right to self-government on reservations