Why do you think that the cherokee were known as one of the ‘Five Civilized Tribes’ ?

because they were more civilized than the other tribes

Explanation:

The Chickasaw people moved to Indian Territory during the "Great Removal," on what was called the "Trail of Tears." Other tribes forced to relocate were the Cherokee, Choctaw, Creek and Seminole, called the "Five Civilized Tribes" because of their highly developed ruling systems.

c]extended voting rights to african americans

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.