Know Your Constitution: The Fifteenth Amendment This week, we are looking at the Fifteenth Amendment. It says that US citizens cannot be kept from voting because of their race, color, or because they were once enslaved. It also says that Congress has the power to make laws to help protect this right. The Fifteenth Amendment is an important part of the history of voting rights in the United States. What does protecting the right to vote mean to you? Follow along as we keep lea