Where did Jim Crow learn these techniques?

Jim Crow was the name of the racial caste system which operated primarily, but not exclusively in southern and border states, between 1877 and the mid-1960s. Jim Crow was more than a series of rigid anti-black laws. It was a way of life. Under Jim Crow, African Americans were relegated to the status of second class citizens. Jim Crow represented the legitimization of anti-black racism. Many Christian ministers and theologians taught that whites were the Chosen people, blacks were cursed to be servants, and God supported racial segregation. Craniologists, eugenicists, phrenologists, and Social Darwinists, at every educational level, buttressed the belief that blacks were innately intellectually and culturally inferior to whites

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