The Democrats did not long remain out of power; and they kept the control of the governmental policy in their hands pretty steadily until the time of the civil war; nevertheless it is true that with the defeat of Van Buren the Jacksonian Democracy, as such, lost forever its grip on the direction of national affairs. When, under Polk, the Democrats came back, they came under the lead of the very men whom the original Jacksonians had opposed and kept down. With all their faults, Jackson and Benton were strong Union men, and under them their party was a Union party. Calhoun and South Carolina, and the disunionists in the other Southern States were their bitter foes. But the disunion and extreme slavery elements within the Democratic ranks were increasing rapidly all the time; and they had obtained complete and final control when the party reappeared as victors after their defeat in 1840. Until Van Buren's overthrow the nationalists had held the upper hand in shaping Democratic policy; but after that event the leadership of the party passed completely into the hands of the separatists. The defeat of Van Buren marks an era in more ways than one. During his administration slavery played a less prominent part in politics than did many other matters; this was never so again. His administration was the last in which this question, or the question springing from it, did not overtop and dwarf in importance all others. Again, the presidential election of 1840 was the last into which slavery did not enter as a most important, and in fact as the vital and determining factor. In the contest between Van Buren and Harrison it did not have the least influence upon the result. Moreover, Van Buren was the last Democratic president who ruled over a Union of states; all his successors, up to the time of Lincoln's election, merely held sway over a Union of sections. The spirit of separation had identified itself with the maintenance of slavery, and the South was rapidly uniting into a compact array of states with interests that were hostile to the North on the point most vitally affecting the welfare of the whole country.