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Why do port cities often grow into large metropolises?

User Lilbeth
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They become a hub for exports and imports due to the advantage of having a coast. Secondly, and in addition to the first comment, it becomes a huge hub for immigrants and outer city citizens to find work, which boosts the port city economies so that they may enjoy more luxuries instead of working for survival. That’s why historically, port cities are very rich and very luxurious
User Volvox
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Answer:

Transportation and commerce. They become the main hub for trade, exports and imports, and transportation. They are essentially an economic hotspot for regions.

User Mikerowehl
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