Hopewell culture shows little evidence of warfare

War, in one form or another, has been a part of the human experience for centuries.

Archaeologist Lawrence Keeley, in his book War Before Civilization, argues that it has been with us for millennia, but that historians and archaeologists have downplayed its importance because we like to think our ancestors were smarter than us and lived in more or less perfect harmony.

The evidence against that, however, is growing stronger with each discovery.