The champions of democracy are suddenly worried about a democratically elected president enacting the will of the people who elected him. Truth is stranger than fiction.
I would first like to clarify that I am not a citizen of USA, but I still support their right to have and enforce borders - same as I support it for every other country in the world. I don't think what happened hundreds of years ago was right, but no person that is alive today had anything to do with it.
I am not sure if I correctly understand your position. Do you believe that anyone from anywhere in the world should be able to come and live in the USA, and also receive benefits from taxes that were paid by citizens?