New york city became the nations greatest commercial center because the (blank) funneled western produce down the hudson river

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.

napoleon the third became a empire in 1873 also known as the era of the franco-prussian war.