Why does the 15 Amendment matter

The Fifteenth Amendment granted voting rights to African American men, providing the most important key to participation in the American democratic process to millions of formerly enslaved, and politically excluded, people.

Explanation:

So this allows us to vote and it will not be denied by the people who needs the vote, no matter what race you are, your vote still counts.

Explanation:

The right of citizens of the United States 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.