Many here have spoken about the cultural differences between the different parts of America. As an Australian I feel that I cannot comment on, or provide first-hand experience, but I believe that the best source on this topic is Joel Garreau's "The Nine Nations of North America".
"Forget the pious wisdom you've been handed about North America.
Forget the borders dividing the United States, Canada, and Mexico, those pale barriers so thoroughly porous to money, immigrants, and ideas.
Forget the bilge you were taught in sixth-grade geography about East and West, North and South, faint echoes of glorious pasts that never really existed save in sanitized textbooks.
Forget the maze of state and provincial boundaries, those historical accidents and surveyors' mistakes. The reason no one except the trivia expert can name all fifty of the United States is that they hardly matter.
Forget the political almanacs full of useless data on local elections rendered meaningless by strangely carved districts and precincts.
Consider, instead, the way North America really works. It is Nine Nations. Each with its capital and distinctive web of power and influence.... These nations look different, feel different, and sound different from each other, and few of their boundaries match the political lines drawn on current maps....
Most importantly, each nation has a distinctive prism through which it views the world."
[Garreau, pp. 1-2]
For more (albeit basic) information about some of the points raised in the book try
http://www.harpercollege.edu/~mhealy/g101ilec/namer/nac/nacnine/na9intro/nacninfr.htm , though it's well worth glancing through the book itself. Be warned however - it was written in 1981 and is probably a bit out of date.
Now returning to the country that I know and love/hate ("So don't sing me your anthem/ when you don't know the words/ Words are hard to remember when they mean nothing at all" - Weddings, Parties, Anything) - Australia, currently undiscussed.
As an island nation, with no land borders, our closest neighbour (New Zealand) being culturally near-identical, a government that seems insistent upon retaining our aloofness and non-commital status in the region (the Asia-Pacific/Australasia), and a Prime Minister who seems more intent on slavishly following the lead of the President-in-Thief than developing an independent foreign policy, Australians are prime candidates for the non-travelling peoples of the world.
But somehow the idea of the Aussie Backpacker is prime, we have some of the greatest international sportspeople in the world (IIRC at least one of the top ten competitors in each of the world's 50 most popular sports is an Australian) the heads of some of the world's biggest corporations (John Pizzey is next in line for the top job at the world's biggest mining company, Pittsburg-based Alcoa; James Gorman is the Melbourne lawyer who has just been appointed head of Merrill Lynch's US private client group; Charlie Bell is now next in line at McDonalds, proving you don't have to go to university to make it on the global business stage; Douglas Daft is at the top of Coke; Geoffrey Bible running Philip Morris; Jac Nasser scoring the top job at Ford are examples (more will probably be found at
www.crikey.com.au over the next week).
An Australian was mixed up with British political troubles recently (Peter Foster, anyone) and we now get the easiest run to the World Cup Soccer than any other country in the world (bring on Trindad & Tobago, we can take them!). Our scientists have given the world the bionic ear, the stump-jump plough, the world's first teleport device (all right we only moved a photon. Better than anyone else though!). Great beaches, awesome scenery (as soon as we can stop the governmetn knocking it al down...) and more venomous creatures than any comparable place on earth!
It's well worth going here -
http://www.bbc.co.uk/dna/h2g2/alabaster/A12295 - for more humourous information.