What was the result of the attack on the lusitania? a. russia withdrew from the war. b germany fortified its western front. c. japan joined the war. d. america threatened to cut-off ties with germany.

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.

they made rome the dominant power in the mediterranean.