History of the Catholic Church in the United States British-America-born Catholic priest. In 1788, after the Revolution, John Jay urged the New York Legislature to require office-holders to renounce foreign authorities "in all matters ecclesiastical as well as civil." In one state, North Carolina, the Protestant test oath would not be changed until 1868. The Catholic population of the United States, which had been 35,000 in 1790, increased to 195,000 in 1820 and then ballooned to about 1.6 million in 1850, by which time, Catholics had become the country’s largest denomination. Between 1860 and 1890 the population of Roman Catholics in the United States tripled primarily through immigration and
History of Christianity in the United States most Christians in the United States are Mainline Protestant, Evangelical, or Roman Catholic. Because the Spanish were the first Europeans to establish settlements on the mainland of North America, such as St. Augustine, Florida in 1565, the earliest Christians in the territory which would eventually become the United States were Roman Catholics. However, the territory that would become the Thirteen Colonies in 1776 was largely populated by Protestants due to Protestant settlers seeking religious freedom from the Church of England (est. 1534). These settlers were primarily Puritans from East Anglia, especially just before the English Civil War (1641–1651); there were