There is no law that says that we have to allow people who hates us to enter the US. It’s been allowed but can be reversed at anytime.
There is no law that says that we have to allow people who hates us to enter the US.
For VISAs you would send required documents to the US Embassy in your country.
If all is in order there will be an appointment for an interview. There are questions and the interviewer is suppose to get an idea for their feelings about the USA.