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List of sovereign states - Wikipedia
State | Definition, History, Figures, & Facts | Britannica
Differences Between a Country, State, and Nation - ThoughtCo
International law - States, Sovereignty, Treaties | Britannica
How US Territories, Like Puerto Rico, Obtain Statehood - ThoughtCo
Statehood and recognition in world politics: Towards a critical ...
Nation-state | Definition, Characteristics, & Politics | Britannica
Statehood - an overview | ScienceDirect Topics
Formation and Recognition of States Under International Law - Justia
Nation State | Definition, Characteristics & Examples - Study.com