I believe it's industrialization. <span />
BET’s success will show other networks that hiring African American actors and producers will bring success to their networks and tv shows.
This is going to be our environment. =)
Answer and explanation;
-Most African Americans weren't allowed to join the army due to segregation thus, most of them moved to the factories north to help in any way possible by building weaponry and such.
-The desire of black Southerners to escape segregation was a major cause of the great migration, 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.
