I don’t think we have, actually. In the United States at least it seems like the inclination is simply to expand outward to use all of the available space–this practice manifests itself in suburban sprawl in places like Utah and California. Only when space runs out will there be any significant changes in building practices. This is evident in places like Hong Kong and Manhattan where dense populations (with no room for expansion)have required building vertically. Compare these cities with London and Los Angeles, two heavily populated cities that are not geographically bounded. Their response to increasing populations has been to build outwards not upwards, and so these two cities sprawl into the surrounding suburbs.
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