member states of the united nations
(un), as defined by the un. all members of the un are sovereign states, though not all sovereign states are necessarily members.
a sovereign state, in international law, is a political entity that is represented by one centralized government that has sovereignty over a geographic area. international law defines sovereign states as having a permanent population, defined territory, one government, and the capacity to enter into relations with other sovereign states. it is also normally understood that a sovereign state is neither dependent on nor subjected to any other power or state.
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.