 Complete the following phrase:  As early as the 18th century, Appalachia then known simply as the backcountry began to distinguish itself from its wealthier lowland and coastal neighbors to the east. Frontiersmen often bickered with lowland and tidewater elites over taxes, sometimes to the point of armed revolts such as the Regulator Movement 17671771 in North Carolina. In 1778, at the height of the American Revolution, backwoodsmen from Pennsylvania, Virginia, and what is now Kentucky took part in George Rogers Clarks 