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Mexico City was built atop the ruins of the Aztec city of Tenochtitlan, which in turn was built along several islands on the lake Texcoco. After conquest by the Spanish Empire in the 16th century, the lake was slowly drained. Nowadays, it has been completely desiccated, but there are still underground aquifers and muddy soil beneath the city.

Water table depletion has contributed to the slow sinking of many parts of the city, especially those close to the ancient lake bed. Nowadays, 2-3 million people are affected by this occurrence.

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Q: What caused land subsidence in Mexico city?
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