Well we were still pretty divided in the 1850's...here's a rough timeline how federation happenned
- 1880's at this point there's some very basic ideas, including Australia being composed of Australia, New Zealand and Fiji (But not Western Australia ie Perth)
- 1890's we realise "oh crap its almost the start of the 1900's we should get this thing done before then because its a big and scary event. Fiji already pulled out
- At federation - New Zealand pulls out at the last hour (we no literally but you get the idea) while Western Australia joins in the last second.
- 1920's/30's Western Australia decides to unjoin (This lasted like a month somewhere in that time period...) and become a seperate nation. Make their own flag then the rest of the states look at them as if to say "you look ridiculous, what the hell are you doing" and they get all self-concious and are like "nothing" and decide not to leave the country...
But the point is - Federation only really kicked off in the 1890's. What you could foreseeably do is...
UP - The power of mateship (Australia can ask for more than one city at congresses and other civs are more likely to give them cities)
Then
1899 - Spawn Australia in Canberra (sinice that is the capital of Australia...even though it didn't get founded until later because Melbourne and Sydney were having a hissy fit over which city should be the new capital)
1901 - World congress. (1 turn to try to sure up relations) The Australian civ can ask for however many cities there are on its own continent. (So in theory you could simulate if WA didn't join straight away (though Perth doesn't get founded an awful lot in my experience), Aus/NZ commonwealth etc.). This also means that if Australia isn't wholey British (should be a chance of this happenning, not only Dutch chance but also French (primary threat to British colonisation) and German (Well, I know in my own city of Adelaide there was a signifigant German presence.) chances
From there you play as a vassal of Britain. With the statute of Westminster (Same act that would give Canada and South Africa independence in the game) we were given the oppurtunity to become independent but didn't ratify until during WWII (during WWII we really just switched from UK vassal to US vassal if you like
)