The agent of this change is war. Strayer says that the increased intensity of war in the fourteenth century and following was necessary to distinguish inside and outside, and he regards the process of state-building after Boo as inevitable (pp. 57-58). However, Charles Tilly argues against Strayer that there was nothing natural or inevitable about the rise of the state. In 130o, Tilly says, there were still five possible outcomes open:
(I) the form of national state which actually emerged; (2) a political federation or empire controlled, if only loosely, from a single center; (3) a theocratic
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