 Intolerance became more than an attitude on August 11, 1834, when a mob set fire to an Ursuline convent in Charlestown, Massachusetts.The resulting "nativist" movement, which achieved prominence in the 1840s, was whipped into a frenzy of anti-Catholicism that led to mob violence, the burning of Catholic property, and the killing of Catholics.This violence was fed by claims that Catholics were destroying the culture of the United States.