When is World Cities Day?

When the United Nations focuses on global urbanization, October 31st is World Cities Day, the United Nations focuses on global urbanization. The United Nations addresses the challenges urbanization faces as well as promoting urbanization. Cities work on sustainable urbanization.

Urbanization refers to the increasing number of people who live in urban areas. This pattern is relatively recent in terms of new construction. A vast number of the world's population lived in rural areas at one time. Over 90% of the world's population lived in rural areas in 1800. Many high-income countries began to see a change during the 19th century. More and more people were moving to urban areas.

This pattern was especially true in the United States. By the year 2000, 80% of the population lived in urban areas. On a global basis, half of the world's population lives in cities. The following are some of the world's most populated cities:: : Some of the world's most populated cities include:

• Tokyo – 37 million
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