https://www.irs.gov/individuals/international-taxpayers/taxa...
"C. Which Form to File: Nonresident aliens who are required to file an income tax return must use Form 1040-NR, U.S. Nonresident Alien Income Tax Return"
https://www.irs.gov/forms-pubs/about-form-1040-nr
NOT YOUR LAWYER. Just providing links to a government website that explains what that government requires of people who earn US income.