The reason is not only because even chinese movers and shakers studied in the usa, but im usa u have everything.
U have japanese, chinese and koreans, u can get everything in usa when u have money.... Also u have silicon valey, u have wall street, u have commodity exchanges.... U can much easier find people who think like u..
Shareholder culture in europe are dozens of years behind USA, Even online banking costs like much more than in anerica...
USA u can still Open a garage shop, in europe all the paperwork is hilarious