IMO, the U.S. will become similar to Russia. It’s not some sudden societal collapse scenario; just an oligarchy with high levels of corruption and incompetence. Most people will conform or keep their heads down to avoid the consequences of stepping out of line. If you’re in a possibly targeted group, you may want a valid passport though. And it’s always been a good idea to keep at least a months worth of non-perishable food on hand in case of supply chain disruptions. Possibly stuff like emergency propane heaters and a propane tank could be useful too (they’ve been useful for me in the past already without an authoritarian government or social unrest). Knowing your neighbors and helping eachother out in little ways is probably the most powerful thing though.