In the context of warfare, economic crisis, and demographic decline, seventeenth-
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Rulers encountered formidable obstacles in achieving these goals. Without paved roads, telephones, or other modern technology, it took weeks to convey orders from the central government to the provinces and even longer to distant colonies. Rulers also suffered from lack of reliable information about their realms, making it impossible to police and tax the population effectively. Local power structures presented another serious obstacle. Nobles, the church, provincial and national assemblies, town councils, guilds, and other bodies held legal privileges, which could not easily be rescinded. Many kingdoms were composed of groups of people of different ethnicities who spoke a language different from that of the ruling dynasty, which further diminished their willingness to obey.
Nonetheless, over the course of the seventeenth century both absolutist and constitutional governments achieved new levels of power and national unity. They did so by transforming emergency measures of wartime into permanent structures of government and by subduing privileged groups through the use of force and through economic and social incentives. Increased state authority may be seen in four areas in particular: greater taxation, growth in armed forces, larger and more efficient bureaucracies, and territorial expansion both within Europe and overseas.
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Over time, centralized power added up to something close to sovereignty. A state may be termed sovereign when it possesses a monopoly over the instruments of justice and the use of force within clearly defined boundaries. In a sovereign state, no system of courts, such as church tribunals, competes with state courts in the dispensation of justice; and private armies, such as those of feudal lords, present no threat to central authority. While seventeenth-