Answer and Explanation:
The Thirteenth Amendment had the greatest impact because it placed a ban on slavery or involuntary servitude, and opened a path to racial equality. Although the Fourteenth Amendment (which grants citizenship and protection to everyone born or naturalized in the United States) and Fifteenth Amendment (which grants suffrage—or right to vote—to every citizen of the United States, regardless of race or color) had a great impact, the Thirteenth Amendment had the greatest impact, not only on Americans, but on many people around the world—all human beings are equal and shouldn't be subjected to slavery because of their color.