What is that makes the United States such an attractive place to immigrate to for people whose skill sets could take them almost anywhere in the world? As a Eu

What is that makes the United States such an attractive place to immigrate to for people whose skill sets could take them almost anywhere in the world? As a European who spent his last 3 summers in the US, and now participating in H1B lottery, my motivation is pretty simple: money, and also prestige stemming from working for a well-recognized tech company in the core of SV that will follow me when I get back my home country, or immigrate to some country I find more desirable. Spending few months in Bay Area and in Seattle made me pretty disillusioned about the whole "land of the free" thing, about equality and justice for all. It also made me concerned about my own personal safety, something I never ever felt back home. But for the salary, I find that Canada is in almost every way superior for immigration purposes, not to mention Germany, Switzerland, Denmark or Sweden.