Question: John Brown, was an American abolitionist who believed and advocated that armed insurrection was the only way to overthrow the institution of slavery in the United States, Brown first gained attention when he led small groups of volunteers during which series of violent political confrontations in the United States between 1854 and 1861 involving anti-slavery "Free-Staters" and pro-slavery "Border Ruffian", or "southern" elements in Kansas?
Sentence (from "The Unconstitutionality of Slavery"): In the pamphlet, Spooner shows that none of the state governments of the slave states specifically authorized slavery, that the U.S. Constitution contains several clauses that are contradictory with slavery, that slavery was a violation of natural law, and that the "intentions" of the Constitutional Convention have no legal bearing on the document they created.
Relevant evidence: No