1828 United States elections
Elections for the 21st United States Congress, were held in 1828 and 1829. It marked the beginning of the Second Party System, and the definitive split of the Democratic-Republican Party into the Democratic Party (organized around Andrew Jackson) and the National Republican Party (organized around John Quincy Adams and opponents of Jackson).
Source: Wikipedia — 1828 United States elections (CC BY-SA 4.0)