The correct answer is:
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C. To appeal to the dissatisfied, multi-ethnic population of the Soviet Union.
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Gorbachev was not trying "to establish his dominance," as the other answer here had suggested. When Gorbachev came into leadership in the USSR, the Soviet economy was struggling and there were dissidents across the spectrum of the country who called out for reforms and changes.
In 1985, Mikhail Gorbachev proposed policies of perestroika (restructuring) and glasnost (openness) in the Soviet Union. Perestroika meant allowing some measure of private enterprise in the Soviet Union. Glasnost meant allowing a bit of freedom in regard to speech and publication.
Encomenderos or DeVaughn provided for Indian tribute in exchange for protection and Christian instruction.
I believe that historians have found artifacts that the Indus Valley Civilization made in the area the Sumerians were. There also might have been written evidence.
The main reason why so many of the machines that sped up production and travel were invented during the 18th and 19th centuries is because this was the time of the Industrial Revolution, which saw a great increase in factory production, which helped create the machines in question.
Napoleon III attempted to install a French empire in "A. Russia," since this was part of his overall plan to conquer all of Europe. He ultimately failed in this, however, due to the harsh Russian winters.