What does the governor mean essential and nonessential.

essential = needed for life/survival

nonessential = not needed for survival

Explanation:

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.

american troops were forced to withdraw following deadly bombings.

explanation: