Assume I live in Country A. Assume I have bitcoins. Assume country A "firewalls" all bitcoin traffic so internal accounting servers cannot communicate with accounting from the world.
Assume that this continues for 10 years with billions of in-country transactions.10 years later the firewall is opened. Does every in-country transaction chain have to be added to every account chain in the world? Do all of the world's transactions have to be added to the in-country transactions?