Which federal amendment guarantees the right to vote regardless of race?

The Fifteenth Amendment guarantees the right to vote regardless of race. Ratified in 1870, this amendment specifically prohibits the federal and state governments from denying a citizen the right to vote based on "race, color, or previous condition of servitude." This was a significant step toward ensuring that the right to participate in the electoral process was extended to all men, particularly following the Civil War and the abolition of slavery.

The other amendments listed do not address voting rights in relation to race. The Nineteenth Amendment grants women the right to vote, but it does not pertain to racial discrimination. The Eighteenth Amendment established the prohibition of alcohol, and the Twenty-first Amendment repealed the Eighteenth Amendment. Neither of these amendments relates to issues of race in the context of voting rights.