The history of Roman Catholicism in the United States – prior to 1776 – often focuses on the 13 English-speaking colonies along the Atlantic seaboard, as it was they who declared independence from Great Britain in 1776, to form the United States of America. However, this history – of Roman Catholicism in the United States – also includes the French and Spanish colonies, because they later became the greater part of the contiguous United States.
In 1634, Maryland recorded a little less than 3,000 Catholics out of a population of 34,000 (around 9% of the population). In 1757, Pennsylvania recorded fewer than 1,400 Catholics out of a population of about 200,000. In 1785, when the newly founded United States (formerly the Thirteen Colonies) contained nearly four million people, there were fewer than 25,000 Catholics (about 0.6% of the population).
Catholicism was introduced to the English colonies with the founding of the Province of Maryland.[6] Maryland was one of the few regions among the English colonies in North America that was predominantly Catholic. However, the 1646 defeat of the Royalists in the English Civil War led to stringent laws against Catholic education and the extradition of known Jesuits from the colony, including Andrew White, and the destruction of their school at Calverton Manor.[7] During the greater part of the Maryland colonial period, Jesuits continued to conduct Catholic schools clandestinely.
Maryland was a rare example of religious toleration in a fairly intolerant age, particularly amongst other English colonies which frequently exhibited a militant Protestantism. The Maryland Toleration Act, issued in 1649, was one of the first laws that explicitly defined tolerance of varieties of Christianity. It has been considered a precursor to the First Amendment.
After Virginia established Anglicanism as mandatory in the colony, numerous Puritans migrated from Virginia to Maryland. The government gave them land for a settlement called Providence (now called Annapolis). In 1650, the Puritans revolted against the proprietary government and set up a new government that outlawed both Catholicism and Anglicanism. The Puritan revolt lasted until 1658, when the Calvert family regained control and re-enacted the Toleration Act.
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https://archive.org/details/CatholicAmerica
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https://creativecommons.org/publicdomain/mark/1.0/
Information link
https://en.wikipedia.org/wiki/History_of_Roman_Catholicism_in_the_United_States