The political unrest continued. Slavery was still the most absorbing topic, and it was upon their stand for or against slavery that all the Presidential candidates were chosen. The pretensions and demands of the Southern leaders had by this time passed into threats. They declared roundly that they would take their States out of the Union if slavery were not quickly made lawful all over the country, or in case a "Black Republican" President should be elected. The Democrats, unable to agree among themselves, split into two sections, the Northerners nominating Stephen A. Douglas for President, while delegates who had come to their National Convention from what were called the Cotton States chose John C. Breckinridge. A few men who had belonged to the old Whig party, but felt themselves unable to join the Republicans or either faction of the Democrats, met elsewhere and nominated John Bell.

This breaking up of their political enemies into three distinct camps greatly cheered the Republicans, and when their National Convention came together in Chicago on May 16, 1860, its members were filled with the most eager enthusiasm. Its meetings were held in a huge temporary wooden building called the Wigwam, so large that 10,000 people could easily assemble in it to watch the proceedings. Few conventions have shown such depth of feeling. Not only the delegates on the central platform, but even the spectators seemed impressed with the fact that they were taking part in a great historical event. The first two days were taken up in seating delegates, adopting a "platform" or statement of party principles, and in other necessary routine matters. On the third day, however, it was certain that balloting would begin, and crowds hurried to the Wigwam in a fever of curiosity. The New York men, sure that Seward would be the choice of the convention, marched there in a body, with music and banners. The friends of Lincoln arrived before them, and while not making so much noise or show, were doing good work for their favorite. The long nominating speeches of later years had not then come into fashion. "I take the liberty," simply said Mr. Evarts of New York, "to name as a candidate to be nominated by this convention for the office of President of the United States, William H. Seward," and at Mr. Seward's name a burst of applause broke forth, so long and loud that it seemed fairly to shake the great building. Mr. Judd, of Illinois, performed the same office of friendship for Mr. Lincoln, and the tremendous cheering that rose from the throats of his friends echoed and dashed itself against the sides of the Wigwam, died down, and began anew, until the noise that had been made by Seward's admirers dwindled to comparative feebleness. Again and again these contests of lungs and enthusiasm were repeated as other names were presented to the convention.