No sponsoring, no nothing.
Many years ago there was a program in the US whereas you could get a working permit if no locals had your qualifications.
Say a company needed a DHC-5 pilot. You applied from somewhere abroad and the company would have to advertise 3 times in the local paper for such a pilot.
No joy and you get hired with a "sponsor" kind of visa.
These days you better marry a US citizen and apply for a green card.
No guarantee however, lots of abuse doing that and it better be real.
Not that I have ever done that of course..