Like you said, you’re not American.

The Declaration of Independence clearly states that civil rights are inalienable. So, we can probably safely say that the Constitution was written with this belief in mind (the status of the Founding Fathers as slave owners and not granting women or non-land owners the right to vote notwithstanding).

Well, no, it’s not. There’s nothing in the Constitution guaranteeing the rights of immigrants or any non-citizen outside of the country.