Here in the US, financial aid is given to undergraduates based on their parents finances. FAFSA which opens federal funds to college students is not for international students because no federal aid is forthcoming to you.
You are dependent on money colleges and private organizations give that do not exclude international students.
You should read the many threads in the archives for international students looking for money to study in this country
Most colleges that have extensive financial aid do require the finances of both parents (all four parents, in many cases, when parents have remarried) to be taken into consideration. This is for US students as well as for international students. These are the rules of our system. If a parent refuses to give out financial info, complete the forms can, let alone pay what the college expects under formula, that’s too bad for the student.
Such students look for scholarship money that does not require parental input, or go to school part time or not at all. That’s the way it works here