Australia’s much closer to the U.S. than Canada is
Barbara Yaffe of the Vancouver Sun illustrates the differences between the US-Australia and US-Canada relationships. Australia’s geographic isolation from the West leads to a stronger desire in the country for good relations with the West, particularly the US. This relationship in turn leads to improved US immigration options (E-3 visas for example) for Aussies.
The U.S. Immigration Law Blog by Ashwin Sharma 