Large portions of the US populations arguably already live in shantytowns; run down inner cities inhabited by great migration blacks, sprawling exurbs in the south and south west inhabited by recent hispanic immigrants, many illegal, and trailer parks in the rust belt where white factory workers layed off by globalization are dying from opioids.

Its only in a few well insulated big cities that the true effects of globalization are kept far enough away to not be immediately obvious.