Inappropriate farming practices and over-cultivation of cotton from before the Civil War led to extensive land erosion by the early 20th century. Together with mechanization of agriculture and damage due to infestation by the boll weevil, there were losses in this part of the economy. Population declined. Up to the mid century, many blacks left the area in two waves of the Great Migration, seeking escape from Jim Crow conditions, and jobs and better lives in northern and midwestern industrial cities. Farmers shifted to cultivating peanuts and later pine trees to reclaim and restore the land. Population losses continued throughout the 20th century, as the forest and lumber industry did not require as many laborers.