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 (1767–1771) 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 Clark's Illinois campaign. Two years later, a group of Appalachian frontiersmen known as the Overmountain Men routed British forces at the Battle of Kings Mountain after rejecting a call by the British to disarm. After the war, residents throughout the Appalachian backcountry—especially the Monongahela region in western Pennsylvania, and antebellum northwestern Virginia (now the north-central part of West Virginia) — refused to pay a tax placed on whiskey by the new American government, leading to what became known as the Whiskey Rebellion. The resulting tighter Federal controls in the Monongahela valley resulted in many whiskey/bourbon makers migrating via the Ohio River to Kentucky and Tennessee where the industry could flourish.