Guyana's political system centers on a unicameral National Assembly elected through proportional representation, a method introduced in 1964 after the colonial government sought to address concerns that the previous electoral arrangement disadvantaged the Indo-Guyanese community. Since 2001, the Assembly's 65 seats have been filled through a closed-list system combining ten regional constituencies with a national list, and the presidential candidate of the party or coalition winning the most seats becomes head of state and government.
Guyana's earliest modern party, the People's Progressive Party (PPP), was founded in 1950 by Cheddi Jagan, Forbes Burnham, and Janet Jagan, and won a decisive victory in the 1953 colonial elections. A rift within the PPP led Burnham to establish the People's National Congress (PNC) in 1957, and the two parties came to draw support largely along ethnic lines, with the PPP associated with the Indo-Guyanese community and the PNC with Afro-Guyanese voters. The PNC governed from independence in 1966 until 1992, when internationally monitored elections returned the PPP, then contesting as the PPP/Civic (PPP/C) coalition, to power.
A third major force, the Alliance for Change (AFC), formed in 2005 as a multiethnic party drawing members from both traditional camps, and later joined the PNC Reform in the APNU+AFC coalition that governed from 2015 to 2020, before the PPP/C returned to office following the 2020 election. Ethnic-based voting patterns have continued to shape competition among Guyana's major parties, even as smaller and multiethnic groupings have sought to broaden the country's political landscape.
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