what was the significance of the 15th Amendment

It outlawed slavery in the United States resulting in the freedom of thousands of slaves
all citizens are granted the right of free speech
the production and consumption of alcoholic beverages was prohibited
it granted African-American men the right to vote

It granted African-American men the right to vote. The 15th Amendment, ratified in 1870, aimed to ensure that the right to vote could not be denied or abridged by the United States or any state on the basis of race, color, or previous condition of servitude. This was a significant step towards securing equal rights and political representation for African Americans in the United States. However, it is important to note that many obstacles such as literacy tests, poll taxes, and intimidation tactics were used to prevent African Americans from exercising their voting rights for several decades after the amendment's passage.