The 15th Amendment to the United States Constitution, ratified in 1870, prohibits the federal and state governments from denying citizens the right to vote based on 'race, color, or previous condition of servitude.' This amendment was a significant milestone in the fight for African American rights and aimed to secure voting rights for freedmen following the Civil War. It is also closely tied to the era of Reconstruction, reflecting the struggle to integrate formerly enslaved people into American political life.