I can't say which one would be more expensive in raw replacement cost. One thing I'd point out is that while urban infrastructure is deep, rural infrastructure

I can't say which one would be more expensive in raw replacement cost. One thing I'd point out is that while urban infrastructure is deep, rural infrastructure is broad. Tens of thousands of miles of highways, railways and irrigation exist largely for bringing material to where food grows and taking food from where it grows to where it is processed and then on to where it is purchased. How many square miles of rural Iowa adds up to single square block of downtown Miami I'm not sure but the potential human toll is much more frightening. Displacing large amounts of people is of course deeply problematic. You need look no further than the situation we're in today with Syrian refugees for evidence of that. But in terms of turmoil, death and violence human displacements tend to pale in comparison to large scale disruptions of food production.