Yes, the world has become more peaceful. It has nothing to do with centralized power. And giving it as a reason to justify or, better, we'll say, ameliorate, US foreign policy would require all ad hominems in the world to address adequately.

Collectivism, what you are preaching, is all the past is; from religion to every flavor of statism and tribalism. Everyone must live for something greater, something other than herself. The extent to which a political entity is successful is the extent to which it can escape that. Freedom and individual rights can only flourish in a decentralized world where everyone can have an efficacious voice and choose for herself. But I don't suppose an idiot such as myself can fairly form cogent opinions on any topic at all really so you just go ahead and take the last word–