Commonwealth of Nations
The land area of the Commonwealth nations is about , or about 21% of the total world land area. The three largest Commonwealth nations by area are Canada at , Australia at , and India at . In 2016, the Commonwealth members had a combined gross domestic product of over $9 trillion, 78% of which is accounted for by the four largest economies: United Kingdom ($2.629 trillion), India ($2.256 trillion), Canada ($1.529 trillion), and Australia ($1.258 trillion).
State government
The Commonwealth of Australia is a federal nation with six states (and two mainland territories). Section 51 of the Australian Constitution sets out the division of legislative power between the states and the Commonwealth (federal) government. The Commonwealth government is given a variety of legislative powers, including control of foreign policy, taxation (although this cannot discriminate between states or parts of states), and regulation of interstate commerce and corporations. Since the original ratification of the constitution, the High Court of Australia has settled a number of disputes concerning the extent of the Commonwealth's legislative powers, some of which have been controversial and extensively criticised; these included a dispute in 1982 over whether the Commonwealth was entitled to designate land for national heritage purposes under United Nations agreements, as well as numerous disputes over the extent of the Commonwealth's power over trade union and industrial relations legislation.