Abstract
Previous efforts to forecast political evolution have been atheoretical extrapolations, with time itself the only independent variable. A mathematical population-pressure theory of political evolution is summarized and applied to two new time series for 20th-century polities—one for the number of states as traditionally identified and a second for the number of “states” when the League of Nations and the United Nations (but not their members) are considered autonomous political units. The number of states unexpectedly increased in proportion to global population density (N= 32.85
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