What major world region has the smallest proportion of its population living in slums?

Northern Africa.

Explanation:

Northern Africa is the region where the smallest portion of the population in slums. North African countries are making progress in reducing slum areas. Most of the countries are introducing new policies for housing and urban development. The flourishing of economic condition in northern Africa countries has helped people engaging in getting employment. The new industrial area, agricultural and crafts towns supported people who moved out of their rural areas in search of job opportunities.

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