What was the significance of the Scopes trial?

"The Scopes Trial, formally known as The State of Tennessee v. John Thomas Scopes and commonly referred to as the Scopes Monkey Trial, was an American legal case in July 1925 in which a substitute high school teacher, John T. Scopes, was accused of violating Tennessee 's Butler Act, which had made it unlawful to teach human evolution in any state-funded school." wikipedia