Both the North and the South had thus gained large possibilities, and at the North the spirit of enterprise and the clear perception of the economic value of free labor as against slave labor were working mightily to help men see the moral arguments of the antislavery people. The division of interest was becoming plain; the forces of good sense and the principles of liberty were consolidating the North against farther extension of the slave-power. The perils foreseen by Calhoun, which he had striven to avoid by repression of all political discussion of slavery, were nigh at hand. The politicians of the North, too, scented the change, and began to range themselves with their section; and, while there was a long struggle yet ahead before the issues would be made up, to the eye of faith the end was already in sight, and the "Free-Soilers" now redoubled their efforts both in discussion and in political action. Thus far, most of the political victories had been with the slave-power, and the South became correspondently arrogant and defiant. The war of ideas against Southern interests now raged with ominous and increasing force in all the Northern States. Public opinion became more and more inflamed. Passions became excited in cities and towns and villages which had been dormant since the Constitution had been adopted. The decree of the North went forth that there should be no more accession of slave territory; and, more than this, the population spread with unexampled rapidity toward the Pacific Ocean in consequence of the discovery of gold in California, in 1848, and attracted by the fertile soil of Oregon. Immigrants from all nations came to seek their fortunes in territories north of 36°30'. What Calhoun had anticipated in 1836, when he cast his eyes on Texas, did not take place. Slave territory indeed was increased, but free territory increased still more rapidly. The North was becoming richer and richer, and the South scarcely held its own. The balance which he thought would be in favor of the South, he now saw inclining to the North. Northern States became more numerous than Southern ones, and more populous, more wealthy, and more intelligent. The political power of the Union, when Mr. Polk closed his inglorious administration, was perceptibly with the North, and not political power only, but moral power. The great West was the soil of freemen.