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The recorded history of Brisbane dates from 1799, when Matthew Flinders explored Moreton Bay on an expedition from Port Jackson, although the region had long been occupied by the Yugara and Turrbal aboriginal tribes. The town was conceived initially as a penal colony for British convicts sent from Sydney. Its suitability for fishing, farming, timbering, and other occupations, however, by 1838, pressure from free settlers led to Brisbane's designation as an area for free settlement in 1842, opening it to non-convict immigrants and beginning its transformation into a commercial and agricultural hub. The town became a municipality in 1859 and a consolidated metropolitan area in 1924. Brisbane encountered major flooding disasters in 1893, 1974, 2011 and 2022. Significant numbers of US troops were stationed in Brisbane during World War II. The city hosted the 1982 Commonwealth Games, World Expo 88, and the 2014 G20 Brisbane summit.