[aksss]

GTK, I didn’t appreciate the level of independence possessed by the Australian states. Unsure of how AUS states locked down - nonetheless, getting six states to agree on something is easier than 50. Point stands that the US could not lock down travel between the states, and it would be impossible to get the states to agree on mutual border closures.

[boatmansloth]

The states didn't agree on anything - when a state had an outbreak other states independently chose to close the border to them and administered border passes until the outbreak subsided.