This article presents the historical development and role of political parties in United States politics, and outlines more extensively the significant modern political parties. Throughout most of its history, American politics have been dominated by a two-party system. However, the United States Constitution has always been silent on the issue of political parties; at the time it was signed in 1787, there were no parties in the nation. Indeed, no nation in the world had voter-based political parties. The need to win popular support in a republic led to the American invention of voter-based political parties in the 1790s. Americans were especially innovative in devising new campaign techniques that linked public opinion with public policy through the party.