Nationalist Abraham Lincoln Preserved the Nation But Confederate Democrats Despised Him for Freeing the Slaves

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Wasn’t Abraham Lincoln a nationalist in his insistance to preserve the union (nation) by not allowing slavery to drive the nation into separation to become two nations? Lincoln was a Republican as later was Martin Luther King, both opposed to the Democrats, so aren’t such as Al Sharpton on the wrong team or do they prefer the Democrats’ plantation mentality?