b.) powers that allow the each branch to curb the others
It put it onto the policy agenda. Thanks to the media, the civil rights fight started getting supporters from all around america and form all classes and ethnicities. Without the media, we can't know when the civil rights would be won because the people wouldn't have known what was going on and to what degree.
Westward expansion began with the Louisiana Purchase, (it was a movement of settlers into the American West.)
