Bartolom\u00e9 de Las Casas championed the rights of the Indians of Mexico and Central America, disputing a widely held belief that they were "beasts" to be enslaved. In a dramatic debate in 1550 with Juan Gin\u00e9s de Sep\u00falveda, Las Casas argued vehemently before a royal commission in Valladolid that the native inhabitants should be viewed as fellow human beings, artistically and mechanically adroit, and capable of learning when properly...