Yes, in respects to all forms of cuisines (Chinese, Italian, Ethiopian, etc.) and their regional varieties, we in Western nations are increasingly being exposed to more authentic forms of such food, thanks both to newer immigrant arrivals as well as a greater understanding and desire to experience more authentic world cuisine. I've had better Ethiopian in Calgary than in either Vancouver or Toronto, and who could have imagined a place like Calgary even having Ethiopian food 15 years ago.
After all, if I was to rate the best authentic Chinese food I have ever eaten, would list a tie between the Qianmen Quanjude Restaurant where I ate in Beijing in 2005 (mmm, roast duck) alongside a very expensive and exclusive Chinese restaurant in San Francisco that a moneyed distant relative took me, my mom and my uncle to in 1995 (again, mmm, roast duck). And living in both Toronto and Vancouver, there are a whole host of restaurants and grocery stores that cater to the newer mainland arrivals. I lived for a time at Warden and Steeles in Toronto, which is right in the middle of a large population of new Chinese immigrants, and can attest to the authentic nature of the large Chinese grocery store across from my apartment.
As for American-style, I know that you can find it down under as well, and is probably the dominant form of Chinese food in every Western nation. Believe American style is even breaking into the Chinese market (though only in the major cities) as well.
In the end, from my perspective, doesn't really matter the style so long as the food tastes good (and the price is right

).