The intent of the 15th amendment was to emphasize the idea of equality through the ability to vote.
The 15th amendment is stated in the United States Constitution under these words: "The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of race, color, or previous condition of servitude.” Before this period, many people were ineligible to vote due to their skin color and/or social status. This ineligibility denied them the rights to vote, opt out of involuntary servitude, participate in political office, and be considered citizens. This amendment aimed to support the overarching concept of equality through providing everyone the constitutional right to vote.