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).
Head of the Commonwealth
In 1949, King George VI was king of each of the countries that then comprised the British Commonwealth (later the Commonwealth of Nations): the United Kingdom, Canada, Australia, New Zealand, South Africa, India, Pakistan, and Ceylon. However, the Indian Cabinet desired the country become a republic, but not depart the Commonwealth as a consequence of no longer having George VI as king, as happened to Ireland. To accommodate this, the London Declaration, devised by Canadian prime minister Louis St. Laurent, stated that the King, as the symbol of the free association of the countries of the Commonwealth, was the Head of the Commonwealth. When India adopted a republican constitution on 26 January 1950, George VI ceased to be its monarch (the President of India, Rajendra Prasad, becoming head of state), but it did regard him as Head of the Commonwealth.