 In 1968, the Supreme Court of the United States ruled in "Epperson v. Arkansas" 393 U.S. 97 (1968) that such bans contravene the Establishment Clause of the First Amendment because their primary purpose is religious.Tennessee had repealed the Butler Act the previous year.The trial revealed a growing chasm in American Christianity and two ways of finding truth, one "biblical" and one "evolutionist".