The reason why the United States has not formed a third party is mainly due to the design of its political system and the particularity of its electoral system. The two-party system is deeply rooted, and the Democratic Party and the Republican Party have a solid foundation in all aspects such as politics, economy, and society. In addition, the single-member district election method makes it difficult for small parties to gain enough support, resulting in voters often choosing major parties with a chance of winning rather than small parties. This situation further suppresses the development space of the third party, making it difficult for it to gain a foothold nationwide. Coupled with the disadvantages of resources such as funds and media coverage, small parties are even more difficult to compete. In short, historical, institutional and realistic factors jointly affect the party structure in the United States, and it is difficult for a third party in the true sense to emerge.
