"...[A] comprehensive look at the 1844 riots that pitted nativist Protestants in Philadelphia against Irish Catholic immigrants. Positioning the riots as a precursor to the Civil War, Schrag details how leaders of the American Republican Party (a forerunner of the Know Nothing Party), including charismatic newspaperman and future U.S. congressman Lewis Levin, fanned the flames of anti-immigrant resentment by alleging that Irish Catholics were a "menace...