By definition - if you want to immigrate to the US (legally) you must be successful.

For example, L1 Visa, will require your company to employ at least 15 people in the US by the end of it. So you either start a company successful enough to hire at least 15 people, or you go home.

If you aspire to live in the US at the end of it, it's a hell of a motivator.

I'll just add - this beneficial system is largely being closed down due to illegal immigration in the US, which "fills" the caps in many places. It may be hurtful to the US long term.