To what political party did Abraham Lincoln belong when elected POTUS?

Abraham Lincoln belonged to the Republican Party when elected as the President of the United States. The party was formed in 1854, primarily opposing the expansion of slavery into western territories. Lincoln, a staunch opponent of slavery, rose within the party ranks and ultimately became its presidential nominee in 1860. His election marked a turning point in American politics and set the stage for the eventual abolition of slavery with the passage of the Emancipation Proclamation in 1863.