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.
People's Party (United States) The Populist movement never recovered from the failure of 1896, and national fusion with the Democrats proved disastrous to the party in the South. National alliance with the Democrats sapped the ability of the Populists to fight the Democrats locally in the South. Early on, this was less of an issue in the Western states where Republicans were strong, as the Democratic-Populist alliance was a more natural fit there, but eventually ended the party.