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>By contrast, the declarative theory of statehood defines a state as a person in international law if it meets the following criteria: 1) a defined territory; 2) a permanent population; 3) a government and 4) a capacity to enter into relations with other states. According to declarative theory, an entity's statehood is independent of its recognition by other states, as long as the sovereignty was not gained by military force.
( https://en.wikipedia.org/wiki/Sovereign_state#Declarative_theory )
No nation claimed the piece of land for themselves. Without the actions of Croatia, Liberland could have already fulfilled this conditions.