Answer :
The states in which there is no entity that can exert sovereignty over their territories are called annexed state.
The exclusive right to exercise supreme political power (legislative, judicial, and executive) over actions taking place inside a territory is known as sovereignty, and because it is the sole right, no other State is allowed to wield formal political authority over that State.
When a state is annexed it looses its sovereignty. Conquest and cession, in which territory is ceded or sold by negotiation, are different from annexation, which is a unilateral act in which land is acquired and retained by one state. If other governments and international organisations largely acknowledge an annexation, it might be considered legitimate.
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