Less corruption and more job opportunity / money I think sums it up for most people. Maybe rights and freedoms being a peripheral concern but for most people their countries of origins are free enough in that they know how to act not to get into trouble. Outside of that I don't think America has much of a culture.
I'll guess you aren't into sports. America has a huge sports culture. In my biased opinion, there are no better sports the world over than basketball and (American) football, both invented here. And the fact that we have states gives us some sense of "civic" pride attached to our local teams. College sports are similar. I'm glued to the screen when Purdue plays basketball. Europe has a basketball league, but the best players play here in the NBA. I'm not a big fan of hockey, and I know Canadians claim it, but the best players play in the NHL (National here being the US, despite teams in Canadian cities)
More job opportunities for the highly educated, absolutely. But I think you'd be suprised at just how corrupt and oligarchic the US is perceived internationally. No other western first world country comes close.
