Without wrangling over the resolutions in the Senate, Douglas made answer to the whole series in a public letter of June 22, 1859, in which he said that "if it shall become the policy of the Democratic party to repudiate their time-honored principles, and interpolate such new issues as the revival of the African slave-trade, or the doctrine that the Constitution carries slavery into the Territories beyond the power of the people to legally control it as other property," he would not "accept a nomination for the Presidency if tendered him." The aggressiveness of Southern opinion on the slavery question was thus shown by Douglas in a negative or indirect view. It is a remarkable fact, that, in still another letter, Douglas argued quite elaborately against the revival of the African slave-trade, which he believed to be among the designs of the most advanced class of pro-slavery advocates. So acute a statesman as Douglas could not fail to see, that, at every step of his controversy with Southern Democrats, he was justifying the philosophy of Lincoln when he maintained that the country was to become wholly free, or wholly under the control of the slave power. The controversy thus precipitated between Douglas and the South threatened the disruption of the Democratic party. That was an event of very serious significance. It would bring the conflict of sections still nearer by sundering a tie which had for so long a period bound together vast numbers from the North and the South in common sympathy and fraternal co-operation. Even those who were most opposed to the Democratic party beheld its peril with a certain feeling of regret not unmixed with apprehension. The Whig party had been destroyed; and its Northern and Southern members, who, but a few years before, had worked harmoniously for Harrison, for Clay, for Taylor, were now enrolled in rival and hostile organizations. A similar dissolution of the Democratic party would sweep away the only common basis of political action still existing for men of the free States and men of the slave States. The separation of the Methodist church into Northern and Southern organizations, a few years before, had been regarded by Mr. Webster as a portent of evil for the Union. The division of the Democratic party would be still more ominous. The possibility of such an event showed how deeply the slavery question had affected all ranks,--social, religious, and political. It showed, too, how the spirit of Calhoun now inspired the party in whose councils the slightest word of Jackson had once been law. This change, beginning with the defeat of Van Buren in 1844, was at first slow; but it had afterwards moved so rapidly and so far, that men in the North, who wished to remain in the ranks of the Democracy, were compelled to trample on the principles, and surrender the prejudices, of a lifetime. Efforts to harmonize proved futile. In Congress the breach was continually widening.