The Leavenworth Constitution was one of four Kansas state constitutions written during the era of Bleeding Kansas. The Leavenworth Constitution was written by a convention of Free-Staters. It was the most progressive of the four proposed constitutions. Important parts of this Constitution were a Bill of Rights that referred to ""all men" (making no distinction between the rights of white men and black men), making slavery in the state illegal, and a basic framework for the rights of women.