TAThatBoomerang

But what about the state of a country being in debt (as opposed to "just" the citizens). Does global banking benefit in any way from this?

Sciency

All loans come with an interest rate. This means that all loans make money, as long as they out-perform inflation. Global banks most definitely like debt of any kind, as long as they're the ones getting the checks.

On a broader note, it could be argued that countries owing each other lots of money is a factor in preventing war. After all, if you knee-cap a construction worker that owes you 1000 bucks, hes definitely not going to be able to earn the money he owes you. Same goes for national economies.