The whole subject of American agriculture viewed in relation to the economic, political, and social life of the nation has important contributions to make. If, for example, we study the maps showing the transition of the wheat belt from the East to the West, as the virgin soils were conquered and made new bases for destructive competition with the older wheat States, we shall see how deeply they affected not only land values, railroad building, the movement of population, and the supply of cheap food, but also how the regions once devoted to single cropping of wheat were forced to turn to varied and intensive agriculture and to diversified industry, and we shall see also how these transformations affected party politics and even the ideals of the Americans of the regions thus changed. We shall find in the over-production of wheat in the provinces thus rapidly colonized, and in the over-production of silver in the mountain provinces which were contemporaneously exploited, important explanations of the peculiar form which American politics took in the period when Mr. Bryan mastered the Democratic party, just as we shall find in the opening of the new gold fields in the years immediately following, and in the passing of the era of almost free virgin wheat soils, explanations of the more recent period when high prices are giving new energy and aggressiveness to the demands of the new American industrial democracy. Enough has been said, it may be assumed, to make clear the point which I am trying to elucidate, namely that a comprehension of the United States of to-day, an understanding of the rise and progress of the forces which have made it what it is, demands that we should rework our history from the new points of view afforded by the present. If this is done, it will be seen, for example, that the progress of the struggle between North and South over slavery and the freed negro, which held the principal place in American interest in the two decades after 1850, was, after all, only one of the interests in the time. The pages of the Congressional debates, the contemporary newspapers, the public documents of those twenty years, remain a rich mine for those who will seek therein the sources of movements dominant in the present day.