Which american policy was meant to keep european countries from getting involved in north and south america?
a. the louisiana purchase
b. the monroe doctrine
c. the tripolitan war
d. the war of 1812

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.

the answer would be logic.

answer; taking up arms to defend the nation;