Australia is a federation of six states, together with ten federal territories. The Australian . Wales, Victoria, Queensland, South Australia, Western Australia, and Tasmania became the founding states of the new Commonwealth of Australia. Subdivisions : Local government areas ; Cadast. Perth is the capital and largest city of the Australian state of Western Australia. It is the fourth-most populous city in Australia, with a population of around Perth Wildcats · Perth Glory FC · Perth Arena · Perth Scorchers. In , a sister state agreement was drawn up between Western Australia and Hyogo Prefecture in Japan that was aimed at Slogan or nickname : The Wildflower State; The.