https://links.org.au/iran-war-shows-dramatic-decline-us-imperialism
Read that and the unpaywalled New Yorker article ...
tldr: U.S. massively dependent on complex, very $$ weapons which Trump2 tosses like confetti. Very limited capacity / ability to resupply, despite massive MIC and requested $1T to Dept. War complex.
The Chinese are literally laughing.