The 13th Amendment read that “neither slavery nor involuntary servitude… shall exist within the United States, or any place subject to their jurisdiction.” What else was declared illegal in the aftermath of the war?

Answer Secession

Secession was officially ruled illegal after the war, as the U.S. Supreme Court determined it unconstitutional in Texas v. White in 1868. The majority opinion, written by Chief Justice Salmon Chase, read "The ordinance of secession...and all the acts of legislature intended to give effect to that ordinance, were absolutely null. They were utterly without operation in law."

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