Although the Civil War brought an end to the plantation and slave labor economy that had made Granville County prosperous, the agricultural sector continued to thrive in the county. Freedmen stayed in Oxford to work, and the discovery of bright leaf tobacco stimulated the industry. Many African Americans in Granville County were already free before the start of the Civil War; some had migrated into North Carolina as free people from Virginia in the colonial era. The free people of color before the Civil War were often descendants of families formed by unions between white women (who were free) and African or African-American men before the American Revolution. They made lasting contributions to the region, particularly through their skilled labor. Several black masons constructed homes for the county's wealthy landowners. Additionally, the bright leaf tobacco crop proved a successful agricultural product for Granville County. The sandy soil and a new tobacco crop that could be "flue-dried" proved a great incentive to farmers and tobacco manufacturers.