The Free Exercise Clause of the First Amendment forms the basis for the separation of church and state: "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof.” Yet, throughout American history, this principle hasn’t stopped Americans from using religious differences to draw boundaries around who is and isn’t American. Joanne digs into the BackStory archives to bring you a selection of segments that look at religious identity in America and how faiths, cultures and rituals adapted to American life.

Image: "Church and state - No Union upon any terms" by Thomas Nast in Harper's Weekly, Feb. 25, 1871. Source: Library of Congress

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