The Philadelphia nativist riots were a series of riots that took place on May 6—8 and July 6—7, 1844, in Philadelphia, Pennsylvania, United States and the adjacent districts of Kensington and Southwark. The riots were a result of rising anti-Catholic sentiment at the growing population of Irish Catholic immigrants. The government brought in over a thousand militia—they confronted the nativist mobs and killed or wounded hundreds of anti-Catholic rioters.