Republicans and Know-Nothings had succeeded in breaking down the Whigs and weakening the Democrats in most parts of the North. But in 1855 it remained uncertain which of these two new parties would emerge as the principal alternative to the Democrats. In about half of the states, Republicans had become the second major party. In the other half the American party, as the Know Nothings now named their political arm, seemed to prevail. But a development of great significance occurred in 1855. The center of nativist gravity began to shift southward.
