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- Meikle, W.E. Evo Edu Outreach (2011) 4: 453. doi:10.1007/s12052-011-0358-x
Laws prohibiting the teaching of human evolution were in effect in some states for over 40 years during the twentieth century. While such laws have been ruled unconstitutional, the opposition to evolution which stimulated their adoption continues as a prominent feature of American culture.