Thus the Americans began their work of western conquest as a separate and individual people, at the moment when they sprang into national life. It has been their great work ever since. All other questions save those of the preservation of the Union itself and of the emancipation of the blacks have been of subordinate importance when compared with the great question of how rapidly and how completely they were to subjugate that part of their continent lying between the eastern mountains and the Pacific. Yet the statesmen of the Atlantic seaboard were often unable to perceive this, and indeed frequently showed the same narrow jealousy of the communities beyond the Alleghanies that England felt for all America. Even if they were too broad-minded and far-seeing to feel thus, they yet were unable to fully appreciate the magnitude of the interests at stake in the west. They thought more of our right to the North Atlantic fisheries than of our ownership of the Mississippi valley; they were more interested in the fate of a bank or a tariff than in the settlement of the Oregon boundary. Most contemporary writers showed similar shortcomings in their sense of historic perspective. The names of Ethan Allen and Marion are probably better known than is that of George Rogers Clark; yet their deeds, as regards their effects, could no more be compared to his, than his could be compared to Washington's. So it was with Houston. During his lifetime there were probably fifty men who, east of the Mississippi, were deemed far greater than he was. Yet in most cases their names have already almost faded from remembrance, while his fame will grow steadily brighter as the importance of his deeds is more thoroughly realized. Fortunately, in the long run, the mass of easterners always backed up their western brethren. The kind of colonizing conquest, whereby the people of the United States have extended their borders, has much in common with the similar movements in Canada and Australia, all of them, standing in sharp contrast to what has gone on in Spanish-American lands. But of course each is marked out in addition by certain peculiarities of its own. Moreover, even in the United States, the movement falls naturally into two divisions, which on several points differ widely from each other.