Very interesting find. But I'm not certain that warfare was the 'driving force' behind the need for building great cities. Trade is more likely, IMO.
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There are no signs of a violent downfall to the area as no signs of battle are evident such as wounded or mutilated bodies. Not only was this an area of peace but also one of pleasure, with evidence of drug use and also aphrodisiacs
Hmm...well, Las Vegas started as a sleepy little rest spot for US troops en route to the West Coast during WWII. And it grew to be a majesitc metropolis, too.
"It has all happened before, and it will happen again..."