The Unionist Party, later known as the Unconditional Union Party in the border states, was a political party in the United States started after the Compromise of 1850 to define politicians who supported the Compromise. It was used primarily as a label by politicians who did not want to affiliate with the Republicans, or wished to win over anti-secession Democrats. Members included Southern Democrats who were loyal to the Union as well as elements of the old Whig Party and other factions opposed to a separate Southern Confederacy.