Almost 150 years after Charles Darwin published his groundbreaking work On the Origin of Species by Means of Natural Selection, Americans are still fighting over evolution. If anything, the controversy has recently grown in both size and intensity. In the last five years alone, for example, debates over how evolution should be taught in public schools have been heard in school boards, town councils and legislatures in more than half the states.
Throughout much of the 20th century, opponents of evolution (many of them theologically conservative Protestants) either tried to eliminate the teaching of Darwin's theory from public school science curricula or urged science instructors also to teach a version of the creation story found in the biblical book of Genesis. The famous 1925 Scopes "monkey" trial, for instance, involved a Tennessee law prohibiting the teaching of evolution in the state's schools. (See The Social and Legal Dimensions of the Evolution Debate in the U.S.)
But beginning in the 1960s, the U.S. Supreme Court issued a number of decisions that imposed severe restrictions on those state governments that opposed the teaching of evolution. As a result of these rulings, school boards, legislatures and government bodies are now barred from prohibiting the teaching of evolution. Teaching creation science, either along with evolutionary theory or in place of it, is also banned.
Partly in response to these court decisions, opposition to teaching evolution has itself evolved, with opponents changing their goals and tactics. In the last decade, some local and state school boards in Kansas, Pennsylvania and elsewhere have considered teaching what they contend are scientific alternatives to evolution -- notably the concept of intelligent design, which posits that life is too complex to have developed without the intervention of an outside, possibly divine force. Other education officials have tried to require schools to teach critiques of evolution or to mandate that students listen to or read evolution disclaimers, such as one proposed a number of years ago in Cobb County, Ga. It read, in part, that evolution is "a theory, not a fact
... should be approached with an open mind, studied carefully and critically considered." The Cobb County disclaimer and a number of other efforts have been withdrawn following successful court challenges by proponents of teaching evolution.
http://pewresearch.org/pubs/1105/darwin-debate-religion-evolution