List the state that had both a substantial slave population in 1860 and a large African - American population in 1990

Virginia in 1860 and New York in 1990.

Explanation:

At the beginning of the civil war, slavery was concentrated mainly in the South; The agricultural production of tobacco and cotton was heavily labored by slaves, guaranteeing a profitable business. By then, there were at least five states concentrating the majority of slaves with more than 400.000; Virginia had the highest population with 490.867 followed by Georgia with 462.198.

On the other hand, in 1990 New York was the state with the largest African - American population with 2.859.000 residents, most of them attracted by industry and job opportunities given in the cities of the North East, being New York the center of attention.

Well I think it's, Maryland, Missouri, Delaware, and Kentucky