Actually, that is not entirely true.
Slaves were still being held in Texas under the authority of Lincoln after the war was over. Both Tom Woods and Thomas DiLorenzo have shown and researched how Lincoln was not only opposed to interfering with slavery in the southern states but he had also held a meeting with several prominent black leaders of the time in an effort to convince them to have their people moved, deported really, to Liberia.
As well, at one point during the war the highest concentration of blacks still in slavery was in New York city.
As one prominent individual pointed out "this proclamation (Emancipation Proclamation) keeps slaves as slaves where we can reach them and frees them where we cannot."
As well, the "Fugitive Slave Act" was in strong enforcement under Lincolns administration. A testament to his true nature on slavery.
Then there are the Douglass and Lincoln debates in Illinois.
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