How long has the US had the two party system?

The United States has had a two-party system since the early 19th century, with the emergence of the Democratic-Republican Party and the Federalist Party in the 1790s. By the 1830s, the Democratic Party and the Whig Party had become the dominant political factions. The Whig Party eventually dissolved in the 1850s, leading to the rise of the Republican Party, which has since been one of the two major parties alongside the Democrats. This two-party system has persisted for over two centuries, shaping U.S. political dynamics.