The development of American agricultural techniques in the period JL prior to 1800 may be thought of as occurring through the amalgamation of the techniques and resources of the Old World and the New. The first half of the nineteenth century, though dominated by the changes imposed by agricultural expansion on the frontier and by a growing urban population, featured also careful evaluation of the differences between American and European agriculture, a process that resulted in extensive but selected borrowings. The middle of the century witnessed declarations of American technical independence on the basis of equality and indeed superiority over Europe in some areas and the dominance of the idea that henceforth agricultural progress would depend on America's own exploration and experimentation.