The term Know-Nothing Riot has been used to refer to a number of political uprisings of the Nativist American Know Nothing Party in the United States of America during the mid-19th century. These anti-immigrant and anti-Catholic protests culminated into riots in Philadelphia in 1844, St. Louis in 1854, Cincinnati and Louisville in 1855, Baltimore in 1856, Washington, D.C. and New York in 1857, and New Orleans in 1858.