Why wasn't america great for african american in 1877-1910?

Slavery was abolished in 1865, though the law says that you can't have african americans as slaves, it did not mean anything else, and white people had huge racist and prejudiced holdings against them, and because of this they were segregated and had been victims of many crimes because of their color because most americans did not like the fact slavery was abolished and treated them like dirt especially in the south.

Explanation:

Unrelated but this led to the great migration of African Americans from southern places to north, about 6 million traveled. (1916-1970)