Jefferson and Adams, of Franklin and Madison, of Hamilton, of Hancock, and of Rutledge, men who labored for the whole country, and lived for mankind, we can not sink to the petty strife which would sap the foundations and destroy the political fabric our fathers erected and bequeathed as an inheritance to our posterity forever. Since the formation of the Constitution a vast extension of territory, and the varied relations arising therefrom, have presented problems which could not have been foreseen. It is just cause for admiration, even wonder, that the provisions of the fundamental law should have been so fully adequate to all the wants of government, new in its organization, and new in many of the principles on which it was founded. Whatever fears may have once existed as to the consequences of territorial expansion must give way before the evidence which the past affords. The General Government, strictly confined to its delegated functions, and the State left in the undisturbed exercise of all else, we have a theory and practice which fits our Government for immeasurable domain, and might, under a millennium of nations, embrace mankind. From the slope of the Atlantic our population, with ceaseless tide, has poured into the wide and fertile valley of the Mississippi, with eddying whirl has passed to the coast of the Pacific; from the West and the East the tides are rushing toward each other, and the mind is carried to the day when all the cultivable land will be inhabited, and the American people will sigh for more wildernesses to conquer. But there is here a physico-political problem presented for our solution. Were it purely physical your past triumphs would leave but little doubt of your capacity to solve it. A community which, when less than twenty thousand, conceived the grand project of crossing the White Mountains, and unaided, save by the stimulus which jeers and prophecies of failure gave, successfully executed the Herculean work, might well be impatient if it were suggested that a physical problem was before us too difficult for mastery. The history of man teaches that high mountains and wide deserts have resisted the permanent extension of empire, and have formed the immutable boundaries of States. From time to time, under some able leader, have the hordes of the upper plains of Asia swept over the adjacent country, and rolled their conquering columns over Southern Europe. Yet, after the lapse of a few generations, the physical law, to which I have referred, has asserted its supremacy, and the boundaries of those States differ little now from those which were obtained three thousand years ago.