![]() Minimum preparations for this massive expansion are clearly in order. At current rates of density decline in the cities of developing countries, for example, when their urban populations double in the next 30 years, as now expected, their built-up areas will likely triple. All or most of the significant factors accounting for density variations and density decline are identified in multiple regression models and the implications of the findings for urban containment and compact city strategies in different regions are examined. Growth was first 4/5 points per decade from 1910 to 1950, and then continued to increase by as much as 9 points from 1990 to 2000. If in 1910 it was 26, in 2020 it went from 93.8 with an increase of over +350 in just 110 years. On average, densities in this historical sample have been in decline since their peak circa 1890☑6, at an average long-term annual rate of 1.0-1.5 percent. A Flourish chart The population density (average population per square mile) of the United States decade by decade. Using historical maps and historical demographic data for 1800–2000, we also report on the threefold decline in average urbanized area densities in a global sample of 30 cities during the twentieth century, following an increase in average density in the nineteenth century. cities between 19, at an average long-term rate of 1.9 percent per annum, on the slowing down of the rate of decline in recent decades, and on the decline in several other density metrics during this period. We report on the five-fold decline in average tract density in 20 U.S. We also find that built-up area densities in this sample declined significantly, at an average annual rate of 2.0☐.4 percent, between 19. We find significant differences in the average population density in the built-up areas of a global sample of 120 cities: In 2000, average density was 28±5 persons per hectare in cities in land-rich developed countries, 70☘ in cities in other developed countries, and 135☑1 in cities in developing countries. Using satellite imagery, census data and historical maps, we report on density variation among cities the world over.
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