This seems bad seen through lens of "everyone should be treated fairly" but if you instead look at it as "America is a private club which accepts membership applications of people that it likes for whatever reasons" then it's quite normal. You have to show that you fit in with whatever you think they want. Some people might be permanently excluded through no fault of their own but the same is true of many clubs or gangs that have all kinds of frivolous reasons for refusing membership.
If it was a small country, that 2nd view might make more sense, but it has so much power that people everywhere are going to alter their lives to try to fit in because it's the most important club around, and those who miss out are going to be very disadvantaged compared to the lucky few who make it in.