What happens if a country blocked external Bitcoin traffic? Say a country decides to completely sever itself from the outside world, like so . Assume no leaks. As I understand, once the local miners process all the international transactions in everyone's' mempools, they'll be left with only local transactions, blocks, nodes, and miners. A (long) while later the difficulty adjusts downward, and you now have a local, codeless, lower-POW "fork" of BTC, even though it's the same code-wise. Travellers can go there and spend their pre-fork balances there again, either sending it to another address they own, or send to locals, though it's obviously severed from whatever transactions they performed outside this country. Assuming they keep up-to-date with the codebase only, and they do this for a long time, say a year and more, what happens once connectivity is restored? Is their local chain just completely wiped out due to lower POW? Would local nodes be forced
