In Political Tribes, Chua argues that humans are tribal and that we need to belong to groups. In many parts of the world, the group identities that matter most – the ones that people will kill and die for – are ethnic, religious, sectarian, or clan-based.
But because America tends to see the world in terms of nation-states engaged in great ideological battles – Capitalism vs. Communism, Democracy vs. Authoritarianism, the “Free World” vs. the “Axis of Evil” – we are often spectacularly blind to the power of tribal politics. Time and again this blindness has undermined American foreign policy.see source