Westward lay the march of American Empire. Within thirty years of the establishment of the Union nine new states had been formed in the Mississippi valley, and two in the borders of New England. As early as 1769 men like Daniel Boone had pushed their way into the Kentucky country, skirmishing with the Indians. But the main movement over the mountains began during the War of Independence. The migration of the eighteenth century took two directions: the advance westward towards the Ohio, with its settlement of Kentucky and Tennessee, and the occupation of the north-west forest regions, the fur-traders’ domain, beyond Lake Erie. The colonisation of New England and the eastern coastline of America had been mainly the work of powerful companies, aided by the English Crown or by feudal proprietors with chartered rights. But here in the new lands of the West any man with an axe and a rifle could carve for himself a rude frontier home. By 1790 there were thirty-five thousand settlers in the Tennessee country, and double that number in Kentucky. By 1800 there were a million Americans west of the mountain ranges of the Alleghenies. From these new lands a strong, self-reliant Western breed took its place in American life.