Epperson v. Arkansas, a case argued before the U.S. Supreme Court, challenged the right of a state to outlaw the teaching of evolution in public schools. On Nov. 12, 1968, the Supreme Court ruled that Arkansas Initiated Act No. 1, an anti-evolution law approved by Arkansas voters in 1928, violated the establishment clause of the First Amendment and was therefore unconstitutional, thus setting a legal trend for the nation as a whole.