During the early through mid-20th century, the two waves of the Great Migration led to hundreds of thousands of rural blacks leaving the state. As a result, by the 1930s, African Americans were a minority of the state population for the first time since the early 19th century. They would remain a majority of the population in many Delta counties. Mississippi also had numerous sites of activism related to the Civil Rights Movement, as African Americans sought to re-establish their constitutional rights for access to public facilities, including all state universities, and the ability to register, vote, and run for office.