What political parties was not divided over slavery?

The Republican Party, founded in the 1850s, was primarily united in its opposition to the expansion of slavery into the territories. Similarly, the Democratic Party was initially divided over slavery but eventually coalesced around pro-slavery positions, particularly in the South. In contrast, the Whig Party, before it dissolved, struggled with internal divisions over slavery, leading to its decline. Overall, the Republican Party maintained a more consistent stance against slavery compared to other parties of the era.