Final answer:
Rural-to-urban migration has driven rapid population growth in Middle/South America cities in the last 30 years.
Explanation:
Rural-to-urban migration has been the principal cause of rapid population growth in cities in the Middle/South America region over the past 30 years. The availability of job opportunities in urban areas acts as a pull factor for migrants, while factors like population growth, lack of employment opportunities, and civil unrest in rural areas serve as push factors driving people to move to cities.
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