How did the thirteenth, fourteenth, and fifteenth amendments extend african americans' rights?

African Americans gained the right to vote through the Civil War Amendments, which are the thirteenth amendment that abolished slavery and the fourteenth amendment that granted full citizenship to African-Americans and the fifteenth amendment guaranteed the right to vote to men regardless of their race, color, or previous condition of servitude. Eighteen year olds were then allowed to vote in 1971 because the twenty-sixth amendment gave anyone 18 and older the right to vote. Native Americans were given the right to vote from the Indian Citizenship Act which gave Indians the right to vote in Federal Elections. Woman began to protest and the nineteenth amendment that was passed was the amendment that gave women the right to vote