From The Art and Popular Culture Encyclopedia
A sovereign state or sovereign country, is a political entity represented by one central government that has supreme legitimate authority over territory.
International law defines sovereign states as having a permanent population, defined territory (see territorial disputes), one government, and the capacity to enter into relations with other sovereign states.
It is also normally understood that a sovereign state is independent. According to the declarative theory of statehood, a sovereign state can exist without being recognised by other sovereign states.
Unrecognised states will often find it difficult to exercise full treaty-making powers or engage in diplomatic relations with other sovereign states.