The culture of Australia is essentially a Western culture influenced by the unique geography of the Australian continent, the diverse input of Aboriginal, Torres Strait Islander and other Oceanian people, the British colonisation of Australia that began in 1788, and the various waves of multi-ethnic migration that followed. Evidence of a significant Anglo-Celtic heritage includes the predominance of the English language, the existence of a democratic system of government drawing upon the British traditions of Westminster Government, Parliamentarianism and constitutional monarchy, American constitutionalist and federalist traditions, Christianity as the dominant religion, and the popularity of sports originating in (or influenced by) the British Isles. Australian culture has diverged significantly since British settlement.