There are two main ways to establish and maintain an imperial political structure: (i) as a territorial empire of direct conquest and control with force or (ii) as a coercive, hegemonic empire of indirect conquest and control with power. The former method provides greater tribute and direct political control, yet limits further expansion because it absorbs military forces to fixed garrisons. The latter method provides less tribute and indirect control, but avails military forces for further expansion.Ross Hassig, Mexico and the Spanish Conquest (1994), pp. 23–24, (pbk) Territorial empires (e.g. the Macedonian Empire and Byzantine Empire) tend to be contiguous areas. The term, on occasion, has been applied to maritime republics or thalassocracies (e.g. the Athenian and British empires) with looser structures and more scattered territories, often consisting of many islands and other forms of possessions which required the creation and maintenance of a powerful navy. Empires such as the Holy Roman Empire also came together by electing the emperor with votes from member realms through the Imperial election.
There are two main ways to establish and maintain an imperial political structure: (i) as a territorial empire of direct conquest and control with force or (ii) as a coercive, hegemonic empire of indirect conquest and control with power. The former method provides greater tribute and direct political control, yet limits further expansion because it absorbs military forces to fixed garrisons. The latter method provides less tribute and indirect control, but avails military forces for further expansion.Ross Hassig, Mexico and the Spanish Conquest (1994), pp. 23–24, (pbk) Territorial empires (e.g. the Macedonian Empire and Byzantine Empire) tend to be contiguous areas. The term on occasion, has been applied to maritime republics or thalassocracies (e.g. the Athenian and British empires) with looser structures and more scattered territories, often consisting of many islands and other forms of possessions which required the creation and maintenance of a powerful navy. Empires such as the Holy Roman Empire also came together by electing the emperor with votes from member realms through the Imperial election.