The 'unsociable sociability' Kant describes is itself a product of contingent historical civilizational pressures, not a fixed psychological universal sufficient to guarantee republican federation.

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Kant(as used in epistemology and metaphysics): Immanuel Kant (1724-1804) was an influential German philosopher who argued that our minds shape how we experience reality, and that we can only truly know things as they appear to us, not as they are in themselves.
contingent(De Interpretatione 12–13): Equated with 'possible'; on the two-sided interpretation, contingency excludes necessity (possibility implies non-necessity).
necessary and sufficient conditions(in philosophical analysis): A 'necessary' condition is something that must be true for something else to happen; a 'sufficient' condition is something that guarantees it will happen. This phrase describes what must be true (and what's enough) for a definition to apply.
republican federation(as a political system being discussed): A system of government where people elect representatives to make decisions, and multiple regions or states are united under shared rules—like the United States.

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