AHC: Keep Northern and Southern Democratic Parties separate after the Civil War.

The Democratic Party split in the 1860 election due to growing differences in both sides from what they wanted. How could they be kept separate post Civil War, and what would appear from the death of America's Oldest political party?
 
Perhaps have the Liberal Republicans nominate someone competent like Charles Adams in 1872, and do better. Then, have them take the seats from the Republicans in 1874 midterms, and possibly win 1876. The northern Democrats could go liberal.
 
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