What is true about how the robber barons did business apex?

Answer;

They became rich by building monopolies

Explanation;

-America's tycoons in the 19th and early 20th centuries, nicknamed as "robber barons," built massive empires and accumulated unprecedented wealth.

-Many of these men gained their vast fortunes either at the expense of their factory workers or by methods that were considered unscrupulous even back then, a time when insider trading wasn't yet outlawed.

-However, some of them also gave away their fortunes to build universities, hospitals, libraries, and museums that still dot America today.

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 attempts of the proletariat to rise above this abasement"