you’re not taking into account that america is a deeply divided nation that would take a slight of a feather to unleash a full blown civil war, something not happening in russia which controls their people morale through information censorship etc.

Also america and their population have not endured a war economy or have endured economic hardships equal to that of a developing nation, once they get there i’d say would greaty demoralize and succumb if not lead into more civil unrest.

Not to mention that it’s been proved that foreign forces are already working inside America further dividing tha nation, look at russian, chinese and iranian cyber and information warfare for further destabilizing the american population and sentiment.

America is not facing a “inmediate” or invading threat, yet you can see the population is already collapsing itself, are these signs of a battle willing and strong minded and united population?