Even before the end of the Revolutionary War the movement had begun which was to change in form a straggling chain of sea-board republics into a mighty continental nation, the great bulk of whose people would live to the westward of the Appalachian Mountains. The hardy and restless backwoodsmen, dwelling along the eastern slopes of the Alleghanies, were already crossing the mountain-crests and hewing their way into the vast, sombre forests of the Mississippi basin; and for the first time English-speaking communities were growing up along waters whose outlet was into the Gulf of Mexico and not into the Atlantic Ocean. Among these communities Kentucky and Tennessee were the earliest to form themselves into states; and around them, as a nucleus, other states of the woodland and the prairie were rapidly developed, until, by the close of the second decade in the present century, the region between the Great Lakes and the Gulf was almost solidly filled in, and finally, in 1820, by the admission of Missouri, the Union held within its borders a political body whose whole territory lay to the west of the Mississippi. All the men who founded these states were of much the same type; they were rough frontiersmen, of strong will and adventurous temper, accustomed to the hard, barren, and yet strangely fascinating life of those who dwell as pioneers in the wilderness. Moreover, they were nearly all of the same blood.