How Can State Borders Evolve from Defense toward Integration? The Long-Term Political Evolution of Human Community—A Conditional Framework of Border-Function Transformation, Nested Governance, and Political-Community Evolution

State borders are a foundational institution of the modern international order. They do more than divide territory: they structure legal jurisdiction, security and defense, human mobility, markets and taxation, eligibility for public services, and political identity. The contemporary international order remains organized primarily around sovereign states. The Charter of the United Nations affirms the sovereign equality of its members and requires respect for territorial integrity and political independence. Any theory of future 'border softening' or political integration should therefore avoid treating the present state system as though it were merely a transitional form on the verge of disappearance. Building on earlier Human Happiness Community research on group hostility, civilizational integration, ideological synthesis, and institutional learning, this paper proposes the Border Functional Transformation Model (BFTM). The model treats the state border not as a single physical line but as a bundle of functions that can change at different speeds. At minimum, five dimensions can be distinguished: the security-military border, the mobility border, the economic border, the legal-governance border, and the identity-psychological border. Opening one dimension does not imply that the others disappear at the same time. Border scholarship has long challenged the idea that globalization simply creates a 'borderless world.' Newman argues that borders should be understood as institutions and as ongoing processes of bordering: they can separate, but they can also become spaces of contact and connection. Paasi likewise emphasizes that territories, borders, institutions, and identity narratives are historically constructed and continuously reproduced rather than naturally fixed. (Paasi, 1998). Contemporary political arrangements already show that borders can partially soften while states continue to exist. In the Schengen area, routine internal border checks are in principle removed among participating states, while states themselves remain and internal openness is accompanied by shared external-border management, policing cooperation, and information systems. The European Union also retains principles of conferral and subsidiarity, demonstrating that deeper transnational governance need not imply the concentration of all state power in a single center. On this basis, the paper argues that movement from defensive borders toward integrative borders is better understood as functional reconfiguration than as the sudden disappearance of territorial lines. Possible configurations include hostile defensive borders, stably managed borders, cooperative borders, partially softened borders, nested-governance borders, and higher-level political communities. These configurations are not historically predetermined stages. Security shocks, distributive conflict, identity politics, or changes in public willingness can all reinforce borders again. The paper ultimately defines long-term border softening as a process in which state borders gradually reduce their function as friend-enemy defensive lines while increasingly operating as interfaces for legal coordination, public administration, identity, and multilevel governance. Whether more distant regional or global political communities eventually emerge should remain an open possibility dependent on expectations of peace, public willingness, governance capacity, constraints on power, and the development of shared identity rather than a predetermined endpoint of history.