If you're not from the US and you meet people in the course of business, then obviously the people you meet are going to be more ambitious. It's selection bias. That's what it takes to reach across the ocean to seek out new business opportunities.
I've had friends who never left the US that I made via random channels - chatrooms and the like - and they also were more ambitious and entrepreneurial than me. Yes, people with programming skills so that biases it a lot, but, I also knew plenty of people with such skills in Europe. The difference was quite visible.
