The Declaration of Independence spells this out. It states "all men are created equal" and "are endowed by their Creator with certain unalienable Rights."
Those rights are not granted by government, nor by right of citizenship, as in ancient Rome. No, all are born with the rights to life, liberty and the pursuit of happiness. Additionally, no government can be legitimate unless it derives its powers from the consent of the governed, paraphrasing John Locke.
In fact, it might have been better had the Bill of Rights not been so named. A better description would be the Bill of Prohibitions.
Worth thinking about, for those among us (yes, I overheard you) who seem to fixate on "those damn Mexican illegal aliens." Not to put too fine a point on it, but with the current unemployment rate, you ought to be praying that more of them get hired so that things get done in this town.