The Commonwealth of Australia is a Pacific nation formed in 1901 from five separate colonies of the British Empire. With the Canadian coup against the government in 1905, Australia pledged support to the provisional government with diplomats and trade agreements. Edmund Barton; the country's first Prime Minister was asked to join the British Remnants but turned down the offer seeing that the failing Empire could take care of itself. The country went through hard times during the Great Depression in 1928-1935 although with a stable economy unlike the Remnants helped the nation through the crisis.
The Commonwealth is located in the Pacific Ocean so it doesn't border any nations by land but has maritime borders with New Zealand and th Kingdom of Papua New Guinea.
World War 1
With WWI in 1938 against the Weimar Dictatorship ruled by Rudolph Hess and his adjutant Adolf Hitler the Commonwealth was thrust into a war alongside its allies Canada and New Zealand.