From the mid-1850s on, some Vermonters became activists opposing slavery, which they had previously worked to contain in the South. Abolitionist Thaddeus Stevens was born in Vermont and later represented a district in Pennsylvania in Congress. He developed as a national leader and later promoted Radical Republican goals after the American Civil War. While the Whig Party shriveled, and the Republican Party emerged, Vermont supported Republican candidates. In 1860 it voted for Abraham Lincoln, giving him the largest margin of victory of any state.