Sovereign state

A sovereign state 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.[1] It is also normally understood that a sovereign state is independent.[2] According to the declarative theory of statehood, a sovereign state can exist without being recognised by other sovereign states.[3][4] Unrecognised states will often find it difficult to exercise full treaty-making powers or engage in diplomatic relations with other sovereign states.

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.