But in regard to those continents circumstances are eminently and conspicuously different. It is impossible that the allied powers should extend their political system to any portion of either continent without endangering our peace and happiness; nor can anyone believe that our southern brethren, if left to themselves, would adopt it of their own accord. It is equally impossible, therefore, that we should behold such interposition in any form with indifference. If we look to the comparative strength and resources of Spain and those new Governments, and their distance from each other, it must be obvious that she can never subdue them. It is still the true policy of the United States to leave the parties to themselves, in the hope that other powers will pursue the same course. If we compare the present condition of our Union with its actual state at the close of our Revolution, the history of the world furnishes no example of a progress in improvement in all the important circumstances which constitute the happiness of a nation which bears any resemblance to it. At the first epoch our population did not exceed 3,000,000. By the last census it amounted to about 10,000,000, and, what is more extraordinary, it is almost altogether native, for the immigration from other countries has been inconsiderable. At the first epoch half the territory within our acknowledged limits was uninhabited and a wilderness. Since then new territory has been acquired of vast extent, comprising within it many rivers, particularly the Mississippi, the navigation of which to the ocean was of the highest importance to the original States. Over this territory our population has expanded in every direction, and new States have been established almost equal in number to those which formed the first bond of our Union. This expansion of our population and accession of new States to our Union have had the happiest effect on all its highest interests. That it has eminently augmented our resources and added to our strength and respectability as a power is admitted by all, but it is not in these important circumstances only that this happy effect is felt. It is manifest that by enlarging the basis of our system and increasing the number of States the system itself has been greatly strengthened in both its branches. Consolidation and disunion have thereby been rendered equally impracticable. Each Government, confiding in its own strength, has less to apprehend from the other, and in consequence each, enjoying a greater freedom of action, is rendered more efficient for all the purposes for which it was instituted.