erhm... to answer your question seriously, and kind of ignorantly because, well that's what I do....
Try to picture a world made up of hundreds of countries, with no one gathering place.... with no embassies... no diplomats... no formal way of communicating.
Seriously... picture that for a sec.
It won't answer your question, and it's not really a good defence of the current system... but I think it should at least lend some kind of perspective on what there is.