Political parties seek to attain political power within a government by participating in electoral campaigns. Major factors like representation systems and constitutions impact a country's party structure, determining whether it will be one-party, two-party, or multi-party. Key political cleavages like state vs. church form the basis for parties that remain influential over time despite new issues. The US Constitution is silent on parties because the founders saw them as corrupt, but parties have come to dominate US politics organized around ideologies like conservative vs. liberal economics. Major historical US parties include the Federalists, Democratic-Republicans, Whigs, and modern Republican and Democratic parties.