William Graham was born in 1742 in Augusta County, Virginia, the son of Archibald Graham, a Scottish immigrant, and, according to later family accounts, Margaret Shed Graham. The available record says little about his formal schooling or precise childhood circumstances. He grew up in the Shenandoah Valley during a period of rapid settlement, when immigrant farming families lived close to contested frontiers and depended upon kinship, congregations, militia organization, and local trade for security.

As a young man Graham moved south into the Carolina backcountry and settled in Tryon County, an enormous jurisdiction later divided into Lincoln, Rutherford, and other counties. He acquired land, established a household, and became sufficiently prominent to exercise leadership among frontier settlers. His practical formation would have included farming, horsemanship, firearms, road and terrain knowledge, and the organization of neighbors for defense, although the surviving biographies do not document a particular apprenticeship.

Graham married Susannah Beller Twitty, a widow, though sources place the marriage at different points around the revolutionary period. Their home became associated with the fortified refuge later called Graham’s Fort. Backcountry houses such as his could serve as gathering places when isolated families feared raids or Loyalist violence. Landownership and family alliances strengthened Graham’s standing in a region where formal institutions remained thin.

The imperial crisis turned this local authority into public service. Graham signed the Tryon Resolves in August 1775, joining other county leaders in resisting coercive British policy and pledging support for the Continental cause. On September 9, the North Carolina Provincial Congress appointed him colonel and commandant of the Tryon County Regiment of militia. He also represented the county in provincial congresses during 1776. Those appointments mark the end of his early life: the Virginia-born son of an immigrant had become a leading Carolina frontiersman, prepared to mobilize men, supplies, intelligence, and fortified places in a revolutionary civil war that divided backcountry communities.