Whenever a state occupies a considerable area, it become necessary that power be devolved horizontally. The horizontal expression of power refers to the necessity of ensuring that power in the state is transmitted to every part of the territorial society. The form which this territorial division of state power takes depends on many factors such as the size of thestate, the physical geography of the territory, the similarity of the cultures of its component regions, the ease of communication, and so on. Thus there are various territorial expressions of state power in the forms of unitary governments, federations, and confiderations. This chapter explains, with examples, the nature and features of there three types of governments.