So, likewise, the backwoods mountaineers who dwelt near the great watershed that separates the Atlantic streams from the springs of the Watauga, the Kanawha, and the Monongahela were all cast in the same mould, and resembled each other much more than any of them did their immediate neighbors of the plains.  The backwoodsmen of Pennsylvania had little in common with the peaceful population of Quakers and Germans who lived between the Delaware and the Susquehanna; and their near kinsmen of the Blue Ridge and the Great Smoky Mountains were separated by an equally wide gulf from the aristocratic planter communities that flourished in the tide-water regions of Virginia and the Carolinas.  Near the coast the lines of division between the colonies corresponded fairly well with the differences between the populations; but after striking the foothills, though the political boundaries continued to go east and west, those both of ethnic and of physical significance began to run north and south.

The backwoodsmen were Americans by birth and parentage, and of mixed race; but the dominant strain in their blood was that of the Presbyterian Irish—­the Scotch-Irish as they were often called.  Full credit has been awarded the Roundhead and the Cavalier for their leadership in our history; nor have we been altogether blind to the deeds of the Hollander and the Huguenot; but it is doubtful if we have wholly realized the importance of the part played by that stern and virile people, the Irish whose preachers taught the creed of Knox and Calvin.  These Irish representatives of the Covenanters were in the west almost what the Puritans were in the northeast, and more than the Cavaliers were in the south.  Mingled with the descendants of many other races, they nevertheless formed the kernel of the distinctively and intensely American stock who were the pioneers of our people in their march westward, the vanguard of the army of fighting settlers, who with axe and rifle won their way from the Alleghanies to the Rio Grande and the Pacific.[2]

The Presbyterian Irish were themselves already a mixed people.  Though mainly descended from Scotch ancestors—­who came originally from both lowlands and highlands, from among both the Scotch Saxons and the Scotch Celts,[3]—­many of them were of English, a few of French Huguenot,[4] and quite a number of true old Milesian Irish[5] extraction.  They were the Protestants of the Protestants; they detested and despised the Catholics, whom their ancestors had conquered, and regarded the Episcopalians by whom they themselves had been oppressed, with a more sullen, but scarcely less intense, hatred.[6] They were a truculent and obstinate people, and gloried in the warlike renown of their forefathers, the men who had followed Cromwell, and who had shared in the defence of Derry and in the victories of the Boyne and Aughrim.[7]