Wow. Why would a children's game cause people to insult each other's intelligence and places of origin in a blatantly rude manner? Oh yeah, because we're pokemon fans. Guys, chill out. This is nothing more than a game, and whether it's based off of New York City/USA/North America or Shanghai/China, the quality of the game won't decrease in any way. Personally, I find both arguments very valid after considering both sides.
The Shanghai area is closer to Japan in proximity and culture, and it has the circular lake which looks very similar to the pokeball lake in Isshu. Likewise, Isshu's skinny and rectangular shape matches that of Manhattan a little more than the Shanghai area's, and the red bridge resembles the Golden Gate quite a bit.
I do not think Woogoru supports the America theory in any way, but I am almost positive he is a bald eagle as opposed to a Chinese eagle.
And I don't think the American PC users here are suggesting Manhattan only because they think they're the greatest, or they want it for selfish reasons or egotistical notions. In fact, the users supporting America seem to be more respectful than the Shanghai supporters, and well, Team Shanghai seems to be stating their views as fact when nothing is confirmed yet. (If anything, it seems to me, a lot of people supporting Shanghai because they DON'T want it to be America).
As it's been said, people only see what they want to see, and it works on both sides of the spectrum. So again, nothing is confirmed, both sides are equally plausible, let's all be respectful. Kthx.