While some figures, including notably Daniel Webster, predicted a sweeping political realignment in which the Union Party would unite all those in favor of the Compromise measures, no national organization ever emerged.
Events following the Mexican–American War fueled rising tensions between the free and slave states, as proslavery fire-eaters threatened secession in response to the Wilmot Proviso.
[3] The acquiescence of the Southern Rights leaders to the Compromise after 1851 removed the need for a dedicated Union party.
Ardently proslavery, they rejected secession as unconstitutional and ruinous to the interests of the slave states.
[5] Instead, they advocated a policy of conditional unionism wherein the slave states would remain loyal to the national government so long as the free states agreed to abide by the Compromise and abstain from any future attacks on slavery.