The Constitution does not guarantee all citizens the right to vote. Rather, the right to vote is implied through a patchwork of amendments that restrict how voting rights may be limited. For example, the 15th Amendment reads “[t]he right of citizens of the United States to vote shall not be denied or abridged...on account of race, color, or previous condition of servitude.” Subsequent amendments added gender, failure to pay poll taxes, literacy, and age over 18 to the list of characteristics for which denying the right to vote may not be based.