Why was life hard and unfair for african americans living in the north?

In the late 1990s the U. S. Department of Housing and Urban Development conducted an experiment on economic mobility by tracking thousands of public housing tenants and residents of low-income neighborhoods to see how they fared when moved to other neighborhoods, particularly those with less poverty. Called the Moving To Opportunity project, it tracked nearly 4,600 families, making it one of the largest-scale experiments of its kind-unless you count that other enormous moving-to-opportunity project of the early 20th century called The Great Migration. more than 6 million African Americans escaped the racial terror and degrading labor conditions of the South, throughout the entire first half of the 20th century, moving to northern and western regions of the U. S., where they hoped sanctuary and better jobs awaited them.

Beacese they live in the north and the north is very hard to live at.