In Ava DuVernay's movie "Selma", four little Negro girls were included, they died violently in the 1963 16th Street Baptist Church Bombing in Birmingham, Ala. The movie "Selma" chronicles the Voting Rights Act campaign and communicates the terror of racist violence and is history as a horror movie.
These two people counter the argument that human rights and democracy are not valued by many people in the world by pointing to all the nations in which it exists.
a) A doctrine allowing new states to decide the issue of slavery for themselves.
It basically gave states the power to choose whether they wanted to be free or slave states.