Were all Stone Age civilizations as violent as this article portrays Native Americans to be?
Look at the Aztecs and Incas
Read
Rosseau’s “Noble Savage” myth punctured and punctured well!
Only believed today by American sociology professors & graduate.
Not just "stone age".
A fact of life is that if your nation's population grows, then you need more land. If the neighboring land is occupied by other groups, then you need to conquer them. If your population does not grow, then eventually you will be conquered.
These days, what happens instead is you have your fighting-age men immigrate to other lands, and eventually take over.