The 15th Amendment to the United States Constitution was ratified on February 3, 1870, and it granted African American men the right to vote. The amendment states that the right 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."

The 15th Amendment was a significant milestone in the history of Black Americans, as it represented a hard-fought victory in the struggle for civil rights and equality. It was a key part of the Reconstruction era efforts to grant newly freed slaves full citizenship rights and political participation.

However, despite the passage of the 15th Amendment, many obstacles were put in place to prevent African Americans from exercising their right to vote, such as literacy tests, poll taxes, and violent intimidation. It wasn't until the Voting Rights Act of 1965 that many of these barriers were finally dismantled, leading to a significant increase in Black voter registration and participation in the political process.

Overall, the 15th Amendment played a crucial role in advancing the cause of civil rights in America and continues to be an important symbol of the ongoing struggle for equality and racial justice.