Meh, I wouldn't say that the US has that many amazing trickers...I don't watch too many tricking videos though, so I might just be oblivious to it.
@OP, obviously cities are a better environment to train in, architecture-wise, but that doesn't mean that we should just blame our lack of good training on our unlucky area. I don't think we need to change our architecture or build an obscene amount of parkour parks...
Can you elaborate a little bit more on what you mean about how driving to a training spot isn't the spirit of parkour?
As for the trickers, I think tricking is pretty widespread around the world, it's just that tricking is "cool", so most American trickers only do tricking, while the Russians with all their insane flip skills also do parkour along with it, same with the British.
As for the driving part....well you live in America. You literally cannot reach a place of interest without a car. The nearest park to me is 5 minutes away in a car. Everything around here is structured and "specialized".
For example, one day I feel really bored. I'm bored of the videogames and youtube, and decide to head out side and do some parkour. It's my stress reliever. To me, it's supposed to be a spontaneous activity that I enjoy to blow steam off. Now my problem is, there is no wall around to practice on. All I have is a tree branch which I can do muscle ups on. The privacy fences around here are too flimsy they will break. I train some precisions on two pieces of wood, but it gets boring. I walk outside the neighborhood, and the road that takes me to downtown is 2 miles long, only fields on each side. The neighbor's fence is plastic and not even attached to the ground right. There's a neat concrete complex nearby, but it's fenced with spikes on top. There's a small concrete bridge, but the street is too busy to be training on that.
So in general, if there are obstacles at all in the Suburbs, they are made out of material too fragile to handle a traceur. It's like everything is made out of cookies and cheap plastic.
Also, since I'm at it: I have a younger brother, he's 13, so he can't drive. The nearest park is 5 minutes away with a car, and everybody's too busy to drive him there. His friends are just like him, lazy asses in front of videogames all day. The only solution I see to that is if there's a playground where he can walk to. And there is none. Kids can't go outside and play on their own anymore. By the time they're old enough, they'll be too old to play tag or hide and seek.
Of course, in the end, that might be just my situation since we live relatively far away from downtown, but you get the idea.

I disagree, I think you can find places in the suburbs, its just requires a lot more work and a change of mindset. I'm not saying that its any better than the city, but you can always find places.
I know, but if you put more water in a desert, more life will be created.