Final answer:
Protestants are likely to be found in regions such as Northern Appalachia and the lower Midwest, and the northern Midwest and Great Plains, heavily influenced by historical migration and revivals such as the Second Great Awakening. Mainline Protestants are particularly prevalent in the middle of the U.S., with Methodists in the Great Lakes/Midwest and Lutherans in the Upper Midwest.
Step-by-step explanation:
In the United States, substantial populations of Protestant faith are predominantly found in specific regions influenced by historical migration patterns and religious revivals. Northern Appalachia and the lower Midwest, spanning Ohio to Iowa and Kansas, have diverse denominations resulting from the Second Great Awakening, which include Baptists, Methodists, and lesser-known Christian churches like Disciples of Christ.
Additionally, the northern Midwest and Great Plains, including Minnesota, the Dakotas, and nearby areas, have significant Lutheran populations due to German and Scandinavian settlement in the late 19th and early 20th centuries.
The Mainline Protestants, who are more theologically, politically, and socially progressive, are primarily found in the middle of the United States. Methodists are common in the Great Lakes and Midwest regions, from Pennsylvania to Nebraska, while Lutherans are dominant in the Upper Midwest. The United Church of Christ, historically New England Congregationalists, is prevalent in New England.
Overall, the geography of religion in the United States is diverse, shaped by the nation's history of immigration and settlement. From early Protestant settlers in New England and Virginia, to Roman Catholic immigrants in Maryland, to a variety of Christian denominations spreading across the country, the U.S. religious landscape is complex. Today, the largest groups of Christians in the U.S. are of Protestant denominations, and these are distributed in various regions across the country as outlined above.