What factor(s) in the US south led to the Great Migration of almost 6 million African-Americans to the Mid-West and North during the early to mid 20th Century?

availability of jobs and economic opportunity.

Explanation:

Although the industrialization and urbanization brought new hopes for the African Americans and economic opportunities became one of the most driving factor for the Great migrations, there were other reasons as well. The discriminatory laws in the South made African Americans look of a new space for themselves. There were secret societies in the south that used all kinds of methods to repress the participation of Blacks in the South.