Which group was granted voting rights by the 15th Amendment?

The correct choice recognizes that the 15th Amendment, ratified in 1870, explicitly granted voting rights to men of any race or color. The amendment 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 advancement in the struggle for civil rights, particularly in the context of post-Civil War America when African American men, previously enslaved, gained the constitutional right to vote. However, it's important to note that while the 15th Amendment provided this right to men, it did not extend voting rights to women, which continued to be a separate struggle until the 19th Amendment was ratified in 1920, granting women the right to vote regardless of race.

Thus, the 15th Amendment focused solely on the voting rights of men, making it incorrect to state that it granted rights to women or included a broader category like all citizens over the age of 21, as those rights did not encompass gender. Additionally, limiting the rights to Caucasian men contradicts the intention of the amendment, which was to ensure that men of all races had the opportunity to participate in elections.