What problems was in the movies selma and how it was solved

Lack of Representation in Congress they got a new type of government

I think that the movie Selma was about the struggle of the civil rights workers and their supporters, both black and white to insist on the right of Afro Americans to vote and to have just as much right as white people to exercise the franchise and it was brought about by mass protests and the march over the bridge near Selma. 

Cause of he different elevations  hope this ?