The primary steel industry left the US years ago. China, India, and Japan already are all ahead of the US in steel production. The effects of losing US Steel may be negligible.
Re "America's done": When it comes to foreign trade, I'd say we were "done" right around the time that Trump started claiming "I charged tariffs to China", and people actually believed him.
TLDR: Tariffs are NOT a tax that you can charge to other countries. Full stop. Literally not a thing. There is no mechanism to charge taxes to other countries, and China did NOT pay the US money, let alone "billions and billions of dollars, believe me". Tariffs are a tax on American companies.
As others have mentioned, US Steel is being taking over by Nippon Steel, a Japanese company, not by a country.
US Steel has done an underwhelming job at keeping up with advances in steel production over the last half century - all the people who work (and will continue to work) at plants inside the U.S.A. will hopefully get to be a part of improvements at their facilities.
The fact that Nippon saw enough value in US Steel to buy it is better than many might have expected based on how the steel industry in the U.S.A. has fared over the last 40-50 years.
We are not a manufacturing economy anymore. We are a service and tech economy.
The US has Apple, Amazon, Tesla, Meta, Alphabet, Microsoft, etc. The US will be fine.
You say that as if you are saying something to brag about.
How do nations grow at a rate greater than than the global growth rate? Net exporters or net banking deposits.
Service? It's time to gradually diminish expectations and gradually allow U.S. to shrink if you think service is the answer.
No more inexpensive real estate purchases. See Louisiana Purchase. I don't know if Alaska is worth it. A lot of money is needed to maintain and protect Alaska.
You stated we, U.S. are not a manufacturing nation then you listed a couple of manufacturing companies.