Collison's theories page nudges the reader to look at "red tape" as an explanation for why things go slower these days, but I think there are hidden variables behind a lot of these which are simpler explanations.
First is the price of labour. Most countries have gotten wealthier over the 20th century, America is not full of desperate people willing to work 16 hour days in dangerous construction jobs any more. The Empire State Building, as an example, required 14 human sacrifices to build in 400 days (and likely many more injuries). I hazard to guess the average 80 story building today is built with much fewer deaths.
Second is state or military intervention. Apollo, the Pentagon, and the Berlin Airlift are all projects of the US military at the height of their influence. Shenzen's fast growth is certainly some Chinese planning department's work. It isn't surprisng to me that motivated non-democratic institutions can make big things happen quickly.
First is the price of labour. Most countries have gotten wealthier over the 20th century, America is not full of desperate people willing to work 16 hour days in dangerous construction jobs any more. The Empire State Building, as an example, required 14 human sacrifices to build in 400 days (and likely many more injuries). I hazard to guess the average 80 story building today is built with much fewer deaths.
Second is state or military intervention. Apollo, the Pentagon, and the Berlin Airlift are all projects of the US military at the height of their influence. Shenzen's fast growth is certainly some Chinese planning department's work. It isn't surprisng to me that motivated non-democratic institutions can make big things happen quickly.