I think it's more useful to think of "a huge war" as the effect of the cause of allowing nonsensical wealth concentration via allowing the individual wealth concentrators to use the media, the banks, and governments (the nation's militaries) to enforce hegemony at home and abroad through debt and the use of violence to collect. International trade (as it did in the early 20th century global wars) becomes a vice, as indebted nations are divided between the wealthy that seek to preserve the value of their currency by bone-grinding the locals, fascist forces that seek to become the next bone-grinders, and socialists and idealists whom would rather at the end of the day see debt restructured around social welfare. We've consistently only chosen the first two options throughout all human history.