Why are there only two parties in America?
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.
History of the United States Democratic Party
The Democratic Party is the oldest voter-based political party in the world and the oldest existing political party in the United States, tracing its heritage back to the anti-Federalists and the Jeffersonian Democratic-Republican Party of the 1790s. During the Second Party System (from 1832 to the mid-1850s) under Presidents Andrew Jackson, Martin Van Buren and James K. Polk, the Democrats usually bested the opposition Whig Party by narrow margins. Both parties worked hard to build grassroots organizations and maximize the turnout of voters, which often reached 80 percent or 90 percent of eligible voters (at this time, suffrage was granted only to white males). Both parties used patronage extensively to finance their operations, which included emerging big city political machines as well as national networks of newspapers. The party was a proponent for slave-owners across the country, urban workers and caucasian immigrants.