To apply for a US immigrant visa, a foreign citizen must have some sort of person or entity tat is requesting that they be allowed to immigrate to the USA which can be a relative someone who is a permanent resident or an employer.
There are several different types of immigrant Visa categories including Family Immigrant , a spouse or future spouse of a US national or permanent resident and there are also provisions to adopt children and bring them to the US as future citizens.
For the employment immigration options there are 5 different levels based on your skills and the different levels have different requirements in all of them but the top tier you need to have a sponsor company, and all must pass muster with the Dept of Labor as far as need to the US.
There is also a Special Immigrant classes that are established the most common right now are for people who have done service for the US in Iraq the most common being interprets and if they can show that because of their employment they face above average possibility of harm they are prioritized and there is even a new visa class that is being designed to facilitate getting more of them out of the war zones.
There is also the DV lottery a popular way for people to try to immigrate to the US every year they have a drawing and those that qualify and win the lottery are allowed to immigrate with out a sponsor. the idea of this visa is that the US became a strong nation based on the diversity of our immigrants and that continued allowing of different types of people will continue to keep America strong.
One of the things that they do during processing is to make sure that you are not a risk to America for instance if have a communicable disease,a mental disorder; have committed serious crimes; are terrorists, and if have used illegal means to enter the U.S.
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