ACCORDING to the census of 1800, the United States of America contained 5,308,483 persons. In the same year the British Islands contained upwards of fifteen millions; the French Republic, more than twenty-seven millions. Nearly one fifth of the American people were negro slaves; the true political population consisted of four and a half million free whites, or less than one million able-bodied males, on whose shoulders fell the burden of a continent. Even after two centuries of struggle the land was still untamed; forest covered every portion, except here and there a strip of cultivated soil; the minerals lay undisturbed in their rocky beds, and more than two thirds of the people clung to the seaboard within fifty miles of tide-water, where alone the wants of civilized life could be supplied. The centre of population rested within eighteen miles of Baltimore, north and east of Washington. Except in political arrangement, the interior was little more civilized than in 1750, and was not much easier to penetrate than when La Salle and Hennepin found their way to the Mississippi more than a century before. A great exception broke this rule. Two wagon-roads crossed the Alleghany Mountains in Pennsylvania,--one leading from Philadelphia to Pittsburg; one from the Potomac to the Monongahela; while a third passed through Virginia southwestward to the Holston River and Knoxville in Tennessee, with a branch through the Cumberland Gap into Kentucky. By these roads and by trails less passable from North and South Carolina, or by water-ways from the lakes, between four and five hundred thousand persons had invaded the country beyond the Alleghanies. At Pittsburg and on the Monongahela existed a society, already old, numbering seventy or eighty thousand persons, while on the Ohio River the settlements had grown to an importance which threatened to force a difficult problem on the union of the older States. One hundred and eighty thousand whites, with forty thousand negro slaves, made Kentucky the largest community west of the mountains; and about ninety thousand whites and fourteen thousand slaves were scattered over Tennessee. In the territory north of the Ohio less progress had been made. A New England colony existed at Marietta; some fifteen thousand people were gathered at Cincinnati; half-way between the two, a small town had grown up at Chillicothe, and other villages or straggling cabins were to be found elsewhere; but the whole Ohio territory contained only forty-five thousand inhabitants. The entire population, both free and slave, west of the mountains, reached not yet half a million; but already they were partly disposed to think themselves, and the old thirteen States were not altogether unwilling to consider them, the germ of an independent empire, which was to find its outlet, not through the Alleghanies to the seaboard, but by the Mississippi River to the Gulf.