A more interdependent world is a friendlier and more secure world. When countries are completely independent of each other they will be able to more easily shrug off economic consequences of their aggression. Economic ties also foster greater cultural exchange and understanding, so the less of those there are the insular and navel-gazing the inhabitants of such countries will tend to be, which will also increase the…
No, it's not. Wars between major trading partners aren't historically uncommon at all.
> When countries are completely independent of each other they will be able to more easily shrug off economic consequences of their aggression.
When countries (particularly those toward opposite ends of the extraction -> intermediate goods -> finished goods -> finance & services spectrum) are integrated with trade, it produces durable inequalities through ricardian specialization and strong resentments that are either subjugating through imperial domination, mollified through political union and welfare policies, or expressed in war. Sometimes the latter even after the former through political union.