The Federation
I'm probably the last person to see all these new North American political maps floating around the Web. But, just in case, here are three from: Richard Friedman, Mena Trott, and Tim Bray.
If Australia's going to be aligning itself closely with the U.S. (it is, and it does), then perhaps we should be joining the Federation — I'm sure they'd accept representation on the western rim of the Pacific :-).