Hayes-Tilden presidential election leaves 20 electoral votes from four states unresolved, triggering constitutional crisis over certification

The 1876 presidential election between Republican Rutherford B. Hayes and Democrat Samuel Tilden produced the most contested result in American history. Tilden won 184 undisputed electoral votes—one short of the 185 needed—while Hayes had 165, with 20 disputed electoral votes from Florida, Louisiana, South Carolina, and Oregon. Both parties submitted conflicting slates of electors from the Southern states, where the Republican-controlled returning boards certified Hayes wins despite Democratic majorities. The Constitution provided no mechanism to resolve conflicting electoral certificates, exposing a fatal gap in the 12th Amendment's certification framework.