Which amendment prohibited racial discrimination in voting?

The 15th Amendment to the United States Constitution, ratified in 1870, prohibits the federal and state governments from denying a citizen the right to vote based on "race, color, or previous condition of servitude." This amendment aimed to secure voting rights for African American men following the Civil War. However, various discriminatory practices continued to undermine its effectiveness until the Civil Rights Movement and subsequent legislation, such as the Voting Rights Act of 1965, further protected these rights.