How did al-Rāzī contribute to new medical treatments? He taught medicine at a medical school in Baghdad.
He proved Greek and Indian physicians wrong about diseases.
He wrote about how to treat diseases like smallpox and measles.
He was the author of an important book called The Canon of Medicine.

He wrote about how to treat diseases like smallpox and measles.

Explanation:

al-Razi book on smallpox and measles was not the earliest monograph on the subject . Al-Razi's treatise on smallpox and measles was, however, the more influential and was twice translated into Latin in the 18th century.

both include an amendment process.

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.