Zones of peace, conflict, and democracy -- A regional approach to conflict, integration, and democratization -- Empirical data, measurement, and methods -- Do zones of democracy and peace coevolve? -- Deutschian integration and the democratic peace -- Wealth, conflict, and the diffusion of democracy -- Conclusions and implications -- Appendixes : A. Independent states since 1816 -- B. Armed conflicts from 1816 to 1996 -- C.A primer on generalized additive models -- D. Polity democracy scale and modifications -- E. Symbols and notation.