Two political groups dominate the Australian political spectrum, forming a de facto two-party system. One is the Australian Labor Party, a centre-left party which is formally linked to the Australian labour movement. Formed in 1893, it has been a major party federally since 1901, and has been one of the two major parties since the 1910 federal election. The ALP is in government in Victoria, Queensland, Western Australia, the Northern Territory and the Australian Capital Territory. The other group is a conservative grouping of parties that are in coalition at the federal level, as well as in New South Wales, but compete in Western Australia and South Australia. The main party in this group is the centre-right Liberal Party. The Liberal Party is the modern form of a conservative grouping that has existed since the fusion of the Protectionist Party and Free Trade Party into the Commonwealth Liberal Party in 1909. Although this group has changed its nomenclature, there has been a general continuity of MPs and structure between different forms of the party. Its modern form was founded by Robert Menzies in 1944. The party's philosophy is generally liberal conservatism. Every elected prime minister of Australia since 1910 has been a member of either the Labor Party, the Liberal Party, or one of the Liberal Party's previous incarnations. The Liberal Party is joined by the National Party, a party that seeks to represent rural interests, especially agricultural ones. The Nationals contest a limited number of seats and do not generally directly compete with the Liberal Party. Its ideology is generally more socially conservative than that of the Liberal Party. In 1987, the National Party made an abortive run for the office of prime minister in its own right, in the Joh for Canberra campaign. However, it has generally not aspired to become the majority party in the coalition, and it is generally understood that the prime minister of Australia will be a member of either the Labor or Liberal parties. On two occasions, the deputy prime minister, the leader of the National Party, became the prime minister temporarily, upon the death of the incumbent prime minister. Arthur Fadden was the only other Country Party, prime minister. He assumed office in August 1941 after the resignation of Robert Menzies and served as prime minister until October of that year. The Liberal and National parties have merged in Queensland and the Northern Territory, although the resultant parties are different. The Liberal National Party of Queensland, formed in 2008, is a branch of the Liberal Party, but it is affiliated with the Nationals and members elected to federal parliament may sit as either Liberals or Nationals. The Country Liberal Party was formed in 1978 when the Northern Territory gained responsible government. It is a separate member of the federal coalition, but it is affiliated with the two major members and its president has voting rights in the National Party. The name refers to the older name of the National Party. Federally, these parties are collectively known as the Coalition. The Coalition has existed continually since 1923, with minor breaks in 1940, 1973, and 1987. Historically, support for either the Coalition or the Labor Party was often viewed as being based on social class, with the upper and middle classes supporting the Coalition and the working class supporting Labor. This has been a less important factor since the 1970s and 1980s when the Labor Party gained a significant bloc of middle-class support and the Coalition gained a significant bloc of working-class support. The two-party duopoly has been relatively stable, with the two groupings gaining at least 70% of the primary vote in every election since 1910. Third parties have only rarely received more than 10% of the vote for the Australian House of Representatives in a federal election, such as the Australian Democrats in the 1990 election and the Australian Greens in 2010, 2016 and 2019
