Lincoln did not even want emancipation at first, and grant was corrupt and let his admin loot the government, then abandoned reconstruction to jim crow in a deal to get to keep the 1876 election they stole from tillman for hayes.
That republican party? Hardly.
He did not support abolition until well into the civil war look it up.
He removed missouri's general or whatever keeping them from joining confeds for endorsing the idea in fact.
Regardless that same party abandoned the former slaves to steal an election after rampant corruption.
So any example of the civil war era is also disallowed by your logic. It was not perfect so therefore your example can be discredited.