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#4 - United States - 71,000,000 Catholics
The United States saw the arrival of Catholicism with the Spanish in Florida and Georgia, as well as in California, the Franciscan saint Junípero Serra being one of the main protagonists of this process. The French also brought a Catholic presence to Louisiana, Alabama, Arkansas, Illinois, and Michigan, although much later, in the 18th century, alongside German and English immigrants. The faith was then bolstered in the northeast by Italian and Irish immigrants of the 19th and 20th century, as well as by other Eastern European newcomers, just like Latino and Filipino communities do nowadays.

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