Let's suppose, that at some time the Internet gets split in two, possibly because of wartime, or another possibilities (there was once a situation, when Egypt managed to split the internet in their country from the outside).
- There begins to exist two versions of the blockchain, eg. USACoin and ChinaCoin
- There are some people with access to both internets ("pirate joins")
- Eventually, the internets join back
How would Bitcoin software react to those splits, how would it react to the "pirate joins", how would it handle the final internet join? What would be the "Plan B" of the Bitcoin community?