Singaporean politics have been dominated by the People's Action Party (PAP) since the 1959 general election when Lee Kuan Yew became Singapore's first prime minister (Singapore was then a self-governing state within the British Empire).
The PAP has been in government and won every General Election since then. Singapore left the Commonwealth in 1963 to join the Federation of Malaysia, but was expelled from the Federation in 1965 after Lee Kuan Yew disagreed with the federal government in Kuala Lumpur.
Foreign political analysts and several opposition parties including the Workers' Party of Singapore and the Singapore Democratic Party (SDP) have argued that Singapore is a de facto one-party state.