While far from a guarantee of uniform world peace, please try to name something that has worked better at preventing war than free markets. The existence of one

While far from a guarantee of uniform world peace, please try to name something that has worked better at preventing war than free markets. The existence of one or two counterexamples (dubious ones in my opinion) doesn't do anything for me except make me think "hmm, there sure are a lot fewer examples of international warfare in the last 80 years, compared to the 80 years before that. I wonder what's changed? Oh yeah..."