What is war good for? In Peru it may be good for starting an advanced civilization. Archeologists are studying this occurrence to see how war may have been a common factor in the rise of more advanced civilizations.
The Peru of the first millennium BCE was full of smaller groups, but it isn't until the region endured centuries of war that two large, dominant societies emerged in the vicinity of Lake Titicaca: the Taraco along the Ramis River and the Pukara of the grassland pampas.
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Stop your warmongering Phil.
Without war, we would still be mailing letters at the Post Office.