Which famous explorer from the west is known for his journeys along the silk road? marco polo or christopher columbus?

its b they wanted to be able to expand their trade..

what following?

explanation:

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;