Let's see... military drones; satellite surveillance; comms surveillance; giant network of flock cameras vacuuming up facial, descriptive vehicular, and license plate movement data; small-scale tactical nuclear weapons; a huge fleet of hypersonic aircraft and extremely maneuverable helicopters; decades of urban combat experience; militarized law enforcement; the largest military in the world by orders of magnitude fighting on its own turf; complete control of utilities infrastructure, centralized resource creation for food, fuel and weapons; large stockpiles of modern chemical weapons that they wouldn't hesitate to use for a second if it was an existential threat... the world is a very very different place than it was in the 40s, and the modern US military is very very very very very different than any military was back then. Even if you can argue that our power has grown linearly with more access to guns or whatever, the US military's power has grown at a much much faster rate.
Would you consider the US military presence in Afghanistan comparable to it's presence in the US? How about knowledge of the landscape, ability to understand local cultures, having local contacts, having working transportation routes, resources in place, and the fact that none of the people fighting back are going to be backed by foreign governments? These two scenarios are incomparable.
The Taliban lost immediately and was suppressed indefinitely until the US decided to leave. It's a good demonstration of how well the US military can suppress even decentralized and suicidally fanatical movements for as long as it wants.
Except this violence will absolutely be preceded extensive operations by the giant existing police and national guard presence that knows the neighborhoods like the backs of their hand. They would put a giant dent in that well before a single shot was fired. Would that absolutely be the case if we invaded, say, Canada? Quite likely. The US government has so much existing control on US soil that I'd eat my hat if any US city lasted a week in active conflict.
