NO Privacy No American citizen has complete privacy If you have a cell phone, use the internet pay taxes have credit or been arrested or a host of other tie-ins. If the Federal or State govt wants information they will get it, with or without a warrant, the Constitution means nothing if you have generated enough concern or interest. That's not to say you can't escape but it's hard.
My brother lived basically undetected for years (Evidently the Feds wanted him for something) but had to use alias no credit cards, no bank accounts but died a penniless pauper and would have been buried in public mass burial if he hadn't revealed who he was before he died. Death is about the only way you will get any true privacy.