Ancient Burials Suggestive of Blood Feuds. A study of graves is providing new insight into the social and biological factors that might have motivated violent killings and atypical burials in the southwestern United States and northwestern Mexico between 2100 B.C. and A.D. 50.

See the source article by following the link below:
Ancient Burials Suggestive of Blood Feuds. A study of graves is providing new insight into the social and biological factors that might have motivated violent killings and atypical burials in the southwestern United States and northwestern Mexico between 2100 B.C. and A.D. 50.