The First Replacement Theory
As a result of immigration from Ireland, the Catholic population surged from 663,000 in 1841 to 3.1 million in 1860, from 4.6 percent of the population to 11.5 percent. Foreign-born people made up more than 45 percent of the populations of New York, Chicago, Milwaukee, St. Louis, Cincinnati, Buffalo, and Detroit. While early Catholic immigrants tended to be skilled workers, later arrivals were mostly poor and uneducated, many driven from Ireland by the potato famine between 1845 and 1852. Preachers,…