What taxes does a nonresident alien pay?

In this video I go over the laws that make a nonresident alien pay taxes. (it's still voluntary so you don't have to anyways) This was another little big project.

https://www.law.cornell.edu/cfr/text/26/1.1-1

https://www.law.cornell.edu/cfr/text/26/1.989(a)-1#:~:text=A%20QBU%20is%20any%20separate,A%20corporation%20is%20a%20QBU.

https://www.law.cornell.edu/uscode/text/26/877

https://www.law.cornell.edu/uscode/text/26/872#a

This is for Educational and Entertainment purposes only. I am not giving any legal advice nor am I telling you what to do. Anything you do is done under your own determination and I have no liability to what you or another decides to do with this information