<Li> Rent Is Too Damn High Party (New York) </Li> <Li> World Citizens Party (Massachusetts) </Li> <P> A number of third party, independent, and write - in candidates have performed well in many U.S. elections . </P> <P> Greens, Libertarians and others have elected state Legislators and local officials . The Socialists had 600 mayors at one time before World War I, including Milwaukee, Wisconsin; New Haven, Connecticut; Reading, Pennsylvania; and Schenectady, New York . There have been 20th Century governors elected as independents, and from such parties as Progressive, Reform, Farmer - Labor, Populist, and Prohibition . There were others in the century before . However, the United States has had a two - party system for over a century . The winner take all system for presidential elections and the single - seat plurality voting system for Congressional elections have over time created the two - party system (see Duverger's law). </P>

What types of minor parties form in the us