Which constitutional amendment granted the right to vote regardless of race?

The 15th Amendment, ratified in 1870, specifically states that the right to vote cannot be denied or abridged based on race, color, or previous condition of servitude. This amendment was a significant milestone in the Reconstruction Era, aiming to ensure that African American men, who had been previously denied this basic civil right, could participate in the democratic process. It plays a crucial role in the broader context of civil rights in the United States, as it set the stage for subsequent movements challenging racial discrimination.

The other amendments listed focus on different aspects of voting rights or civil liberties. For instance, the 19th Amendment guarantees women the right to vote, the 24th Amendment prohibits poll taxes in federal elections, and the 1st Amendment protects the freedoms of speech, religion, press, assembly, and petition. While each amendment plays an important role in expanding civil rights, the 15th Amendment is specifically centered around voting rights irrespective of race, making it the correct choice for this question.