How does the debt get split up when a country breaks up?
If, for example, Quebec were to separate from Canada, Quebec would probaly argue that it has no obligation to repay the debts to the Canadian government? It's hard to imagine how they could be forced to accept those debts as their own.
Now, if we imagine that all of Canada were to separate into smaller entities such that there was no clear 'Canada' remaining, what would happen to the debt?
Note that this question isn't about Canada in particular, it's about what would happen, in these cases, in general.
In particular, I'm looking for answers that explain what would happen if none of the states resulting from the separation resembled the original state that took on the debt. Clearly, none of them would have reason to accept the debt. But none would be more liable than the others.