You could always be like us - amalgamate a few states until you get to a decent (easily memorable) number. Australia and continental USA have similar land mass. We have 6 states and 2 territories. I can point them out on a map and tell you the capital cities of each.
So, which states should we abolish?
On a more serious note - I suck at geography. It doesn't really interest me, unless I'm going there. I'd seriously flunk the quiz above, unless it related to the 5 US states I've actually visited