Generally, the lower house in a State Legislative branch is known as the State House of Representatives, is made up of more people, and is a common entry point into State politics as the representatives often represent a wide range of small towns and communities whereas the Senators often represent counties.
regarding the law, the 15th amendment was specifically designed thinking in the rights of black free men.
even though ratified on february 3, 1870, the promise of the 15th amendment would not be fully applied for a long time.poll taxes and literacy tests would allow southern states disenfranchise african americans. only in 1965 the voting rights for african americans would be actually able to vote in the south.
in 1965, president johnson signed the voting rights act, which aimed to overcome legal barriers that prevented african americans from voting as it was guaranteed by the 15th amendment to the u.s. constitution.