Let's say tomorrow there's a US law that any US person who gets caught with bitcoin server goes automatically to jail for lifetime.
And the 2400 US bitcoin nodes would go offline.
What would happen to price?
What would happen to hash power?
How long would it take to recover?
Let's speculate!
Price of bitcoin would crash since US has a huge influence on bitcoin's market and people would be panic selling creating a massive dump that would worsen the crash.
The Blocks produced per day will decrease. Here is a link about a similar topic where what if the hash rate drops. :https://bitcointalk.org/index.php?topic=232325.0
It could take months for bitcoin to recover. but as long as there are miners to mine the blocks bitcoin will eventually recover.