I have now nearly reached the close of my inquiry. Hitherto, in speaking of the future destiny of the United States, I have endeavored to divide my subject into distinct portions, in order to study each of them with more attention. My present object is to embrace the whole from one single point; the remarks I shall make will be less detailed, but they will be more sure. I shall perceive each object less distinctly, but I shall descry the principal facts with more certainty. A traveller, who has just left the walls of an immense city, climbs the neighbor............