What benefits do immigrants bring to the US?

Most of the Benefits brough to the United States are Economical, Migrant workers both legally and Illegally pay their share of social security taxes and Medicare taxes, and maybe they will never see the benefits of that money. Their taxes pay for the benefits of social security recipients in the USA. They bring a younger workforce to replenish the ageing us working population.

According to the United Nations population projections (medium variant), Japan and virtually all
the countries of Europe are expected to decrease in population size over the next 50 years. For example,
the population of Italy, currently 57 million, is projected to decline to 41 million by 2050. The Russian
Federation is expected to decrease from 147 million to 121 million between 2000 and 2050. Similarly,
the population of Japan, currently 127 million, is projected to decline to 105 million by 2050.

This population decline will NOT affect the united states, which will gain 100 million more people, plenty to mantain a healthy workforce, and support most of the retired citizens who depend on Social Security. Note that this population gain is native born, legal inmigrants and Illegal Inmigrants.

Even if inmigration takes a toll on human services like water, energy and enviromenal related to overpopulation, and some bring some form of crime, still inmigration brings a far more benefits to the US economy, Think of Intel and google that bring billions of dollars to the US economy and those company were build by inmigrants from Asia.