They Ruled Everything—Now They’re Footnotes: 15 Political Parties That Once Dominated the World

1. Whig Party (United States)

Dominating American politics in the mid-1800s, the Whig Party produced presidents like William Henry Harrison and Zachary Taylor. It disintegrated over divisions about slavery, allowing the Republican Party to emerge. Its remnants influenced modern conservatism, but the party itself vanished by the 1850s. (history.com)