So, what does China do with a radiated America?
Get their coal and food elsewhere?
Write off the debt we owe them?
Sell their junk to other countries that are going to greatly admire their nuclear machismo?
The good parts wouldn’t be irradiated.
“So, what does China do with a radiated America?”
Go back to a command-directed economy like they had 1950 - 1990.
They’ve used America to get the foreign cash they needed to build build their armed forces back to the level of national dominance they had in the early 1950s. With America out of the way there will be no one to stop them.