Australia has a federal parliamentary democracy and constitutional monarchy form of government. This system originated from British colonization of Australia beginning in 1770, when Captain Cook claimed the land for Britain under the legal doctrine of terra nullius, meaning "land belonging to no one," despite the presence of indigenous Australians. Over the following centuries, Britain established six colonies that were eventually federated in 1901 to form the self-governing Commonwealth of Australia, maintaining allegiance to the British monarch.