What caused many Georgians to migrate to northern cities

During the years between 1916 and 1970, the vast majority (more than 90%) of African-American population have migrated from rural southern states to more urban north states.

The main causes are economic issues, along with poverty and unemployment on the one hand, and still prevalent racial discrimination in the South, on the other. It took place in fourteen southern states, with Georgia being the second most affected after Mississippi.