Per Curiam
did, we now reverse.
II
A
Proposed by Congress in 1866 and ratified by the States in 1868, the Fourteenth Amendment “expand[ed] federal power at the expense of state autonomy” and thus “fundamentally altered the balance of state and federal power struck by the Constitution.” Seminole Tribe of Fla. v. Florida, 517 U. S. 44, 59 (1996); see also Ex parte Virginia, 100 U. S. 339, 345 (1880). Section 1 of the Amendment, for instance, bars the States from “depriv[ing] any person of life, liberty, or property, without due process of law” or “deny[ing] to any person … the equal protection of the laws.” And Section 5 confers on Congress “power to enforce” those prohibitions, along with the other provisions of the Amendment, “by appropriate legislation.”
Section 3 of the Amendment likewise restricts state autonomy, but through different means. It was designed to help ensure an enduring Union by preventing former Confederates from returning to power in the aftermath of the Civil War. See, e.g., Cong. Globe, 39th Cong., 1st Sess., 2544 (1866) (statement of Rep. Stevens, warning that without appropriate constitutional reforms “yelling secessionists and hissing copperheads” would take seats in the House); id., at 2768 (statement of Sen. Howard, lamenting prospect of a “State Legislature … made up entirely of disloyal elements” absent a disqualification provision). Section 3 aimed to prevent such a resurgence by barring from office “those who, having once taken an oath to support the Constitution of the United States, afterward went into rebellion against the Government of the United States.” Cong. Globe, 41st Cong., 1st Sess., 626 (1869) (statement of Sen. Trumbull).
Section 3 works by imposing on certain individuals a preventive and severe penalty—disqualification from holding
