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"Political union" as a book category covers works—fiction and non-fiction—that center on the formation, maintenance, transformation, or dissolution of unions between political entities. It includes history and analysis of federations, confederations, empires, unions of states, supranational organizations (e.g., the European Union), and movements for unionism or secession, exploring themes such as sovereignty, identity, governance, constitutional design, law, economics, diplomacy, and conflict resolution. Books in this category range from scholarly studies and policy-focused accounts to narrative histories, biographies of key actors, and speculative or political fiction that imagines alternative unions or breakups. Readers can expect deep dives into the political mechanics and human stories behind how polities come together or fall apart, and the ethical and practical debates about integration, autonomy, and collective decision-making.

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