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.
Democratic-Republican Party The party was strongest in the South and weakest in the Northeast. It demanded states' rights as expressed by the "Principles of 1798" articulated in the Kentucky and Virginia Resolutions that would allow states to nullify a federal law.[13] Above all, the party stood for the primacy of the yeoman farmers. Republicans were deeply committed to the principles of republicanism, which they feared were threatened by the supposed monarchical tendencies of the Hamiltonian Federalists. The party came to power in 1801 with the election of Jefferson in the 1800 presidential election. The Federalists—too elitist to appeal to most people—faded away and totally collapsed after 1815. Despite internal divisions, the Republicans dominated the First Party System until partisanship itself withered away during the Era of Good Feelings after 1816.