 The United States Constitution prohibits states from restricting voting rights in ways that infringe on a person's right to equal protection under the law (14th Amendment), on the basis of race (15th Amendment), on the basis of sex (19th Amendment), on the basis of having failed to pay a poll tax or any tax (24th Amendment), or on the basis of age for persons age 18 and older (26th Amendment).The administration of elections, however, vary widely across jurisdictions.Only US citizens have the right to vote in federal elections.