What major effect did the fifteenth amendment have on american society? a. it ended slavery permanently in the united states. b. it provided greater access to voting for african americans. c. it established equal protection and due process. d. it lowered the voting age.

The correct answer is B ) It provided greater access to voting for African Americans.

The 15th amendment made it illegal to stop an American citizen from voting based on their "race, color, or previous condition of servitude." Essentially, this amendment made it so that all African-American males of voting age (which at this time was 21) could vote in elections. This was one of the biggest achievements of the US Congress during the era of Reconstruction.