There is a diversity visa category that is specifically geared toward getting diverse immigrants from all over the world. Increasing diversity is not a goal of

There is a diversity visa category that is specifically geared toward getting diverse immigrants from all over the world. Increasing diversity is not a goal of the employment-based green card system, and neither is it a goal in the family-based green card system (it is family unification). The reason for caps is historical. The idea was to reduce any ethnic group from wielding too strong an influence on politics by immigrating in large numbers, but that is now moot because of mostly uncontrolled/lenient immigration from Latin America over decades. The main problem with the US immigration system is the high prevalence of family immigration vs. employment-based immigration. The majority of professional immigrants, such as the doctors who serve rural areas, medical/pharma researchers, postgrads in various scientific disciplines and software and high-tech industry employees are drawn from the latter category, and the majority face insanely long wait periods. This is rapidly eroding the attractiveness of the US as a destination for these people, which can only harm the future prospects of the country.