As his bride, Lucie, was about to be "sold down the river" to the slave markets of New Orleans in 1831, young Thornton Blackburn planned a daring escape from Louisville. Discovered by slave catchers in Michigan, they were slated to return to Kentucky in chains, until the black community rallied to their cause in the Blackburn Riot of 1833. The couple was spirited across the river to Canada, but Michigan's governor demanded their extradition. The Blackburn...