What was the name of 5he theory on trial in the scopes trials

Scopes Trial, also called Scopes Monkey Trial, (July 10–21, 1925, Dayton, Tennessee, U.S.), highly publicized trial (known as the “Monkey Trial”) of a Dayton, Tennessee, high-school teacher, John T. Scopes, charged with violating state law by teaching Charles Darwin ’s theory of evolution.

Explanation:

besides the fact that abraham lincoln abolished slavery, and greatly benefit black people, he had a heavy impact of the definition of what democracy was, and should be.