The destroyed cities that were destroyed because by the Emancipation Proclamation. If Lincoln had learned Torah, and especially the books of Ethics [Musar], then the whole issue would have been resolved without war.

 The destroyed cities ruined by the Emancipation Proclamation are proof the South was right.

Besides that I just want to add for the sake of information, there is slavery in Torah. And Jesus also said that every word of Torah is true and will never be nullified right in the beginning of the Sermon on the Mount.

So to say that slavery is evil, one has to repudiate a both the Torah and Jesus.

Portland has shown once and for all that the South was right. The Proclamation of Emancipation was a ticking time bomb and now it has come time to explode.

I might add that the tzars also discovered this truth with freeing the serfs. [It did not take long for them to destroy the Russian Empire after that. ]

Legally anyway, the slaves were never freed because you would need the Southern States to agree to a Constitutional amendment by their own free will.

From a Torah point of view also there are only a few ways that a slave can be freed. But I am not sure that is applicable here since I think a government proclamation can free slaves but only if the proclamation is legally valid. Lincoln's was not.

So today what is possible? I suggest Rav Israel Salanter's idea of learning Musar (Ethics). This is in order to understand the basic principles of Torah. If Lincoln had learned Torah and especially the books of Ethics [Musar] then the whole issue would have been resolved without war.