It is unknown why people first began to live in big groups, which led to the development of modern cities. It is likely because humans are social animals who have survived thanks to their sense of cooperation and ability to assist one another when functioning in groups. Large urban centres are typically constructed close to the shore or where there are rivers, ports, and harbours. Large cities are typically the hubs of complex human activity including business, government, law, etc. The majority of cities are also rich in cultural amenities including theatres, art galleries, monuments, and so forth.
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