What features characterize the evolution of the U.S. urban system in this past century? To what extent has the 500-percent increase in na- tional urban population during 1900-1990 been accommodated by growth in numbers versus sizes of cities? Given the radical changes in the U.S. economic geography, has the relative size distribution of city sizes changed significantly with, say, strong in- creases in urban concentration and primacy, a popular nation? As urbanization slowed after World War II, did fluctuations in city sizes and Upward/downward mobility of cities dampen, As an Arthur scale economy framework would Predict (Brian Arthurs, 1990)? Finally, what Natural geographic features of a city promote Growth? How important re climate, location, Neighbor cities, and the like? An interrelated Set of questions concerns the agglomeration And mobility of industrial activity within the Set of cities.
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