Cut off the food and fuel supplies to the cities for 2 weeks.
Most major cities, NY, LA, DC even ChiTown are near a sea ports if not right on the waters edge. No way to blockade them. Sorry to tell you that. Look at a map.
64 posted on 12/08/2018 11:28:09 AM PST by central_va
(I won't be reconstructed and I do not give a damn)