AHC: An Australia/New Zealand War

With a POD no earlier than 1600, have Australia and New Zealand fight a significant war against each other.

I think the easiest way is to have Australia and New Zealand be colonized by two different nations, and get involved in a larger war. Or they end up being regional rivals.
 
Aussies Vs Kiwis

World War III in the Eighties. Major Cities destroyed in Australia and New Zealand but they're far luckier that most of the world. Eventually the forces of King Peter the First, former Pentathlete, sends his Royal navy against the rebel forces of Michelle Jackson, formerly of British Rail Engineering Limited, but now the President of the Survivalist League which have fled to New Zealand.

The self proclaimed King of Australia, New Zealand, & Oceania fears a another uprising lead by Jackson and her malcontents that escaped the final battle in the ring city surrounding what was formerly Melbourne. Peter swears that the rebels time has come to an end while Jackson swears the battle has only begun!
 
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