1. Which of these was an economic perestroika reform introduced by Gorbachev? A. stopping grain imports from the U. S.
B. letting Soviets invest in western companies
C. more government control of the economy
D. allowing western investment in Soviet companies

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.