From a very useful essay by James M. Patterson, "The Dogmatic Rivalry at the Heart of America":
These Protestant outbursts coalesced into a prominent mid-nineteenth century faction called “Nativists,” who found a home in the Whig Party. Nativists tended to come from the artisan classes who were negatively affected by the arrival of Irish working in factories whose cheaper products displaced artisanal work and, hence, added to the animus for the Irish as minions of “popish plots.” In his recent book Liberal Suppression, [Philip] Hamburger charts how Nativists began to use the term “liberal” during this period to refer not merely to a kind of political gregariousness [among rival Protestants] but to an independent from “foreign influence.” To be “liberal,” then was the opposite of being Catholic. Because Americans loved liberty, they had to be Protestant, since Protestants rejected the impositions of foreign princes in favor of native liberty of conscience. Hence, Nativists identified themselves as the “American Party” and their political program as “Americanism.”
The early Nativists were animated by their Protestant enthusiasm, but over time, they moved from religious convictions to political ones. ... Indeed, one of the most shocking conclusions of Hamburger’s work is the direct link between the ideology of the KKK and today’s “humanist” associations. ...
It is no coincidence that the three critics of liberalism considered here are Catholic. Both because of crises in the Catholic Church and because of the rapid social change of the past two decades, Catholic intellectuals have had to improvise an explanation and have found it to be liberalism. It is not so much wrong as incomplete, but it does explain how American Catholics and Protestants have diverged in their evaluation of liberalism. In the recent dustup between Sohrab Ahmari and David French, one saw this tension reach the surface. The Catholic Ahmari, in keeping with the American Catholic tradition, held liberalism in contempt for its failure to defend the common good, but for the Protestant French, liberalism was instrumental to forming a coalition for religious freedom against the external authority of the secular state. French seems not to understand that for much of American history, Protestants used the same argument against Catholics.
