The nineteenth century dismantled the last state churches and quietly raised an informal Protestant establishment in the common school. Horace Mann's nonsectarian Bible, Catholic objections, the 1844 Philadelphia Bible Riots, the Blaine Amendment and Reynolds v. United States show the wall often protected a Protestant mainstream as much as it separated church from state.
Historians ask whether Mann's nonsectarianism was neutral pluralism or a soft establishment. The anti-Catholic origins of the Blaine amendments are disputed in modern school-choice fights, and the 1844 riot death toll is only approximate.