This is Mexico's biggest city by population...but maybe not for long, because it's sinking. Name that Venice of North America.

Mexico City is the largest city in North America by population at 21.8 million people in its metro area, and it faces a water crisis. Due to the city pumping water from Lake Texcoco, which it sits on, the rock is sinking at around 10 inches a year (other sources quote numbers as high as 3 feet).

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