Achief characteristic of latin american music is

The answer is:  call and response

In most Latin american music, the lyric that written in second line is a form of response (or commentary)  that given to the lyric that is written in the first line. This call and response pattern is made in order to represent human connection or religious interaction between humans and diety.

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.