Slavery was a Constitutional policy. Article 1, Section 9 contains: "The Migration or Importation of such Persons as any of the States now existing shall thin

Slavery was a Constitutional policy. Article 1, Section 9 contains: "The Migration or Importation of such Persons as any of the States now existing shall think proper to admit, shall not be prohibited by the Congress prior to the Year one thousand eight hundred and eight, but a Tax or duty may be imposed on such Importation, not exceeding ten dollars for each Person." It had nothing to do with the Democratic party or the Republican party. If your linking of slavery with the Democratic party is somehow connected to Lincoln being a Republican, so of course the Republicans freed the slaves, then I'd suggest reading about the presidencies of FDR, LBJ, a bit regarding Nicon's "Southern Strategy", and Clinton. The geographic south of the U.S. was conservative Democratic prior to them, and shifted to conservative Republican. The parties changed. The people in place (for the most part) didn't.