Whether the mortgage is long or short, you have to pay, if one side decides not to pay, then it becomes invalid.
Invalid? try not paying your mortgage. You'll soon find out that cancelling the mortgage is not the only thing that debtors do.
People and organisations walk away from mortgages/treaties/contracts because they can.
yup. And they pay penalties or they go bankrupt to avoid any costs.
Treaties are pretty much the same. They are contracts. They're not all the same either. Each has its own set of clauses of demands and obligations.
BTW, if you go bankrupt, you are pretty much fracked for using anything except cash, because you not only have no credit, you are a credit risk and not a bank or credit union, trust company will touch you.
Canada happens to have a pretty good credit rating and if word got out it ducked out of treaties (contracts), that credit rating would take a beating. Just ask BC's last Dipper gov't.
And if you say so what if our credit rating takes a dive? lol The answer would be that if it did, any interest rates on anything that Canada owes would spike and we'd be paying a LOT more interest than we were. About a third of what we pay now is going to service the interest on the debt. Want Canadians to pay another few % more interest points on the $580 billion we owe now?