Answer:
Fifteenth amendment is the correct answer.
Step-by-step explanation:
Fifteenth amendment denies the state government and federal government from denying the citizens their right to vote on the basis of their colour or race. It was ratified as third and last amendment of the reconstruction era on February 3, 1870.This amendment was important because it gave the African Americans the right to vote and also enabled them to elected for the public office. Even thought the fifteenth amendment protected African Americans voting rights, the southern states enacted laws to prevent them from voting.