European migration into Appalachia began in the 18th century. As lands in eastern Pennsylvania, the Tidewater region of Virginia and the Carolinas filled up, immigrants began pushing further and further westward into the Appalachian Mountains. A relatively large proportion of the early backcountry immigrants were Ulster Scots—later known as "Scotch-Irish", a group mostly originating from southern Scotland and northern England, many of whom had settled in Ulster Ireland prior to migrating to America — who were seeking cheaper land and freedom from Quaker leaders, many of whom considered the Scotch-Irish "savages". Others included Germans from the Palatinate region and English settlers from the Anglo-Scottish border country. Between 1730 and 1763, immigrants trickled into western Pennsylvania, the Shenandoah Valley area of Virginia, and western Maryland. Thomas Walker's discovery of the Cumberland Gap in 1750 and the end of the French and Indian War in 1763 lured settlers deeper into the mountains, namely to upper east Tennessee, northwestern North Carolina, upstate South Carolina, and central Kentucky.