Who is this supposed to be in for who is the audience?

This is supposed to be for blacks, and abolitionists, and they are supposed to watch out for people trying to steal slaves

"radical republicans  won over two-thirds of the seats in the house of representatives and the senate. they now had the power to override johnson's vetoes and pass the civil rights act and the bill to extend the freedmen's bureau, and they did so immediately. congress had now taken charge of the south'sreconstruction."