This December is the 30th anniversary of the fall of the Soviet Union – how does an empire collapse?

Imagine that in 2023, in the fourth year of a pandemic that has exacerbated tensions and damaged the economy, after months of wrangling over internal borders and a sharp rise in the prestige of state premiers vis-à-vis the prime minister, the premiers of New South Wales, Victoria and South Australia meet secretly and declare that the Commonwealth of Australia has effectively ceased to exist and the states will henceforth be independent nations.