If the USA wanted to, it could easily destroy bitcoin, they have more than enough computing power.
It might not be legal for them to do so, but that's their own self imposed limitation, not inability.
No, they don't. Not even close. What they do have is enough money to print more ASICs than the Bitcoin community has.
All the servers, personal computers AND super computers in the world COMBINED do not share enough computational power to put a dent in the Bitcoin network thanks to the widespread use of specialized Bitcoin mining hardware, i.e. ASIC Bitcoin miners.
No, they don't. Not even close. What they do have is enough money to print more ASICs than the Bitcoin community has.