Comment by Max Read on one of many articles about the hyperloop idea promoted by Elon Musk (apparently [edit: somewhat] similar ideas have been around for awhile, including the descriptively named vactrain):
Why would we build a “hyperloop” instead of just moving everyone in America to one huge city?
We could fit basically the entire U.S. population into an area around 9,000 square miles (think New Hampshire) at the population density of Brooklyn (35,000 people per square mile), which is more than enough space for public parks and small (and even, for some, single-family) houses.
A good, comprehensive public rapid-transit system could get you from one end of the city to the other in a couple hours at most.
The rest of the country could be turned into national public wilderness and some large-scale industrialized agriculture. We could also eat bugs for protein and grow vegetable gardens.
I don’t know how serious Read is, but why not, and why only “America”? All ought have access to the opportunity and wonder of The City — the opportunity and wonder of all humans.
Thanks to Max Read for the fun comment, however intended.