the biggest reason america has a two party system is
Two-party system A two-party system is a party system where two major political parties[1] dominate the government. One of the two parties typically holds a majority in the legislature and is usually referred to as the majority or governing party while the other is the minority or opposition party. Around the world, the term has different senses. For example, in the United States, Jamaica, and Malta, the sense of two party system describes an arrangement in which all or nearly all elected officials belong to one of the only two major parties, and third parties rarely win any seats in the legislature. In such arrangements, two-party systems are thought to result from various factors like winner takes all election rules.[2][3][4][5][6][7] In such systems, while chances for third party candidates winning election to major national office are remote, it is possible for groups within the larger parties, or in opposition to one or both of them, to exert influence on the two major parties.[8][9][10][11][12][13] In contrast, in the United Kingdom and Australia and in other parliamentary systems and elsewhere, the term two-party system is sometimes used to indicate an arrangement in which two major parties dominate elections but in which there are viable third parties which do win seats in the legislature, and in which the two major parties exert proportionately greater influence than their percentage of votes would suggest.
Political ideologies in the United States In the United States, the major parties overlap heavily in terms of ideology, with the Democrats more to the left and the Republicans more to the right. Social scientists Theodore Caplow et al. argue, "the Democratic party, nationally, moved from left-center toward the center in the 1940s and 1950s, then moved further toward the right-center in the 1970s and 1980s."[2] Small parties such as the Libertarian Party play a minor role in American politics.