Southern republicans worked to prevent injustice but there was little they could do to

Prevent acts of violence against former slaves.

Explanation:

A...p...e...x

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.

a is the final : )