This article lists a Timeline of notable political rivalries by country. Political party rivalries are not to be confused with rival family houses within a nation, or warring factions from different nations. This list will not indicate every rival political party within a nation, such as in multiple-party governments. Only the most notable and significant political parties are presented. Rival political alliances my be included as well.
United States
References
Timeline of Rival Political Parties Wikipedia(Text) CC BY-SA