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The movement of population
from rural to urban areas. Massive growth of cities and in the urban proportion of the
population is a characteristic of the modern era, particularly the nineteenth and
twentieth centuries, as it has resulted from the Industrial and Agricultural Revolutions.
The Industrial Revolution has and is creating a demand for large numbers of wage workers
in centralized locations and the Agricultural Revolution has and is permitting a smaller
proportion of the population to be engaged in the production of food and other raw
materials.
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