What amendment ensures that citizens have the right to vote regardless of race?

The amendment that ensures citizens have the right to vote regardless of race is the 15th Amendment. Ratified in 1870, this amendment specifically states that the right to vote cannot be denied or abridged by the United States or by any state on account of race, color, or previous condition of servitude. This was a significant milestone in the struggle for civil rights in America, particularly following the Civil War, as it aimed to extend voting rights to African American men.

In contrast, the 9th Amendment addresses the protection of rights not specifically enumerated in the Constitution. The 19th Amendment, ratified in 1920, guarantees women the right to vote, thus addressing gender rather than race. The 26th Amendment, ratified in 1971, lowers the voting age to 18, focusing on age discrimination rather than racial discrimination. Therefore, the 15th Amendment is the correct answer as it directly pertains to voting rights in the context of race.