In the preceding chapter I described a political system that has completely disappeared. This rather extreme structural change raises considerable problems of explana­ tion. In this chapter I try to answer four questions that are concerned with the conditions that made these funda­ mental changes in political structure possible. These are: (a) What are the external forces that impinged on the members of the territorial sections to predispose them to change? (b) What elements in the political system remained relatively continuous during this period? (c) What kind of political structure replaced the terri­ torial section, and what can account for its particular form? (d) What are Iteso social ideas about this new form of political organization?