Why did trade along the silk road flourish during the time of han, kushan, parthian, and roman empires

How w.e.b. dubois wanted to improve the social and economic situation that existed for african americans during the early 19th century?

The strait of magellan connects the atlantic ocean with the a amazon river b. gulf of mexico c. pacific ocean d. caribbean sea select the best answer from the choices provided о а b oo оо

What from the columbian exchange had perhaps the biggest impact on the world?