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.
Progressive Party (United States, 1912) The party's platform built on Roosevelt's Square Deal domestic program and called for several progressive reforms. The platform asserted that "to dissolve the unholy alliance between corrupt business and corrupt politics is the first task of the statesmanship of the day". Proposals on the platform included restrictions on campaign finance contributions, a reduction of the tariff and the establishment of a social insurance system, an eight-hour workday and women's suffrage. The party was split on the regulation of large corporations, with some party members disappointed that the platform did not contain a stronger call for "trust-busting". Party members also had different outlooks on foreign policy, with pacifists like Jane Addams opposing Roosevelt's call for a naval build-up.