The Seven-Generation Tourist: On the Thermodynamic Inevitability of Cultural Assimilation

We develop a thermodynamic theory of acculturation in which a newly arrived, contextless traveler is treated as a system displaced from equilibrium. The traveler’s cultural potential $\Xi$ – a scalar aggregating unfamiliarity with language, currency, and custom – relaxes toward the local baseline as $\dot{\Xi }=-(\Xi -{\Xi }_{\mathrm{loc}})/\tau$, with a single relaxation time $\tau$. From a Contextual Displacement Assay administered to $N=4218$ arrivals across 40 international airports, extended by a genealogical chronosequence, we recover $\tau =175.2\pm 3.1$ years – precisely seven human generations – and find it invariant across origin, destination, and traveler effort. Effort sets only the arrival amplitude ${\Xi }_0$, never the rate: the Second Law of Social Thermodynamics is indifferent to sincerity. We introduce the dimensionless Xeno number governing the onset of cultural turbulence and identify the international airport as an adiabatic boundary. Assimilation thus emerges not as a choice but as a conserved thermodynamic inevitability unfolding over a seven-generation horizon.