The answer is, "To enforce segregation among whites and blacks".
Second Great Awakening
The Second Great Awakening was a Protestant religious revival movement during the early 19th century in the United States. The movement began around 1790, gained momentum by 1800 and, after 1820, membership rose rapidly among Baptist and Methodist congregations whose preachers led the movement. It was past its peak by the late 1850s.
D. Relations between Kongo leaders and the Portuguese became strained
