I don't know... our history is shorter, a little less tumultuous and the biggest chunk that has defined who we are happened in the last hundred years, being the two World Wars.

We do have a (high criticised) citizenship test (http://www.citizenship.gov.au/test/index.htm), the sitting of which is a prerequisite for all applicants for citizenship by naturalisation; however the questions were poorly chosen and I doubt that many Australians by birth would manage a good pass on it without brushing up.