Ma notwithstanding, history shows that trade does not prevent war (and that the idea that it does springs from unbridled optimism about the nature of man). This has been much discussed:

"Can Free Trade Really Prevent War?": https://mises.org/library/can-free-trade-really-prevent-war

"Trade Can Bring War": http://blogs.reuters.com/breakingviews/2015/01/09/review-tra...