Most Democrat cities have huge sea ports and will be able to resupply quite easily.
Dunno how easy it might be. Biden's Secretary of Transportation doesn't know much (if anything) about transportation.
I'm old enough to remember the supply chain disruptions of 2020-2021.
Once Biden bombs the longshoremen, stevedores and truck drivers with his F16s, who is going to unload the ships and distribute the food, water and fuel to the Democrat cities?
Atlas might not have shrugged (yet), but he's been warming up for several years.