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15 hours ago · The Catholic population in the United States grew to 3.1 million by 1860 (or approximately 10 percent of the total U.S. population of 31.4 million), [128] [129] to 6.3 million by 1880 (or approximately 13 percent of the total U.S. population of 50.2 million), [130] [131] and further to 19.8 million by 1920 (or approximately 19 percent of the ...