> the preceding abashevo culture was already marked by endemic intertribal warfare;[43] intensified by ecological stress and competition for resources in the sintashta period. this drove the construction of fortifications on an unprecedented scale and innovations in military technique such as the invention of the war chariot. increased competition between tribal groups may also explain the extravagant sacrifices seen in sintashta burials, as rivals sought to outdo one another in acts of conspicuous consumption analogous to the north american potlatch tradition.[23] it's all pretty convincing for me.
Italy