War is coming. The election of Donald Trump as president of the United States, the dangerous politics of world leaders like Vladimir Putin, and terrorism are but a few exponents of the worldwide tribalization process. Debeuf explains the continuous historical interaction between globalization and tribalization. Tribalization is collective psychology. Debeuf’s insights are based on history and psychology, but also on his personal experience during the Arab Revolution, and during his previous political functions, both as an advisor to the former Belgian Prime Minister and as EU official.