The main reason for the emergence of sub-urbanization in United States and Canada is overpopulation.
Sub-urbanization basically means the growth and shift of people from from central urban areas into suburbs because of over-population.
Many of the cities in U.S. and Canada have became overpopulated resulting to pollution, worse waste conditions, unemployment, rising prices etc.
In conclusion, the main reason for the emergence of sub-urbanization in United States and Canada is overpopulation.
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