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The period from 1880 to 1910 did indeed see significant changes in immigration that notably altered the religious makeup of the United States. This era is characterized by a massive influx of immigrants, particularly from Southern and Eastern Europe. Many of these new arrivals were Catholic and Jewish, differing from earlier immigration waves primarily composed of Protestants from Northern and Western Europe.

The large numbers of Italian, Polish, Russian, and other immigrants during this time led to the establishment and growth of various religious communities that were less represented in American society up to that point. This contributed to a diversification of religious practices and beliefs within the U.S., shifting the landscape from its predominantly Protestant foundations towards a more pluralistic society, which reflected the various traditions and cultural identities of the new populations.

Other time frames mentioned in the options cover different patterns of immigration and demographic changes, but it was during the late 19th and early 20th centuries that the most pronounced transformation of the religious landscape occurred due to the sheer volume and diversity of incoming immigrants.