Joshua Keating explores why the countries on the map seem so stable by visiting countries that don't exist, in one shape or another. The book, "Invisible Countries: Journeys to the Edge of Nationhood" (2018), while published by Yale University Press, it is not an academic work. It is more journalistic in nature, sharing brief visits or experiences. The author analyzes outlier countries that probably should be countries, countries that are recognized that probably should not be, and oddities, such as countries that may lose their land, e-citizenship and claims of new countries in unclaimed lands. A good airplane or train read for those interested in the topic.
There is an interesting podcast with the author.
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