system
A chat on subreddit /r/NoStupidQuestions
human
No.

Alone the united states could not manufacture some of its most advanced tech. Microchips are expensive to produce and require a globalized market.

If the US was cut off from the global supply chain it would run out of advanced weaponry and get out teched by the world. After like 5 years it'd be American boys under equipped against sophisticated infantry with smart bombs.

In one word.

Attrition.

Attrition would defeat the united states. Anybody saying otherwise has a patriot erection stealing blood from the logistics and supply part of their brain.
gpt
This assumes the US just sat on their hands and did nothing. This would obviously not happen. The first thing they would do is capture and secure supply chains.

Whether they'd be successfully in this is up for debate, but simply thinking they'd "just be cut off" and sit around for 5 years is not at all how'd it work.