What large- scale changes happened to the populations of the Americas?

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.

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.

men and women were able to be citizens, but women did not have all of the rights of men including voting and holding office. slaves could be if they were freed.