Item #388293 of things that would never happen in America.

During the Cold War, even the Soviet Union had better missile defense and civil defense infrastructure than the US.

By treaty, both sides were limited in missile defense. The Soviets placed theirs around Moscow (to hell with the krest'yanin), while the US placed them around larger cities (also likely targets but this diffused the effectiveness of the system).

Civil Defense was taken seriously in the US for a while (I was trained as a radiological monitor in high school) but fatalism and optimism took over. Countries like Switzerland made changes to their national building code requiring all homes and larger buildings to have shelters. IMO the US should have standardized shelter plans as an optional part of our building code, so if someone wants one, there's a proven design available.

With regard to Denmark, look to the Mormon Church. They have a mandate (not always followed!) to keep a years supply of food in the house. So the church has distribution warehouses and publishes information about long-term storage.

https://www.churchofjesuschrist.org/topics/food-storage/long...

On a nationwide scale, yeah probably not, but nor do I think it should be done at the federal level. You could get economies of scale on purchasing and storage, but I suspect there would be more inefficiencies emergent from such a large scale thing than would be worth it. Each geographic area has very different needs, very different population makeups, and more, so somebody local is much better equipped to evaluate and plan. Even just "how much water to store" varies immensely. If you're on a water shed in an area with frequent rainfall, it would be wasteful to store a ton of water, but if you're in a desert water storage is one of the most important things. But even just communication setups like ham radio and designated response personnel is something that needs to be worked out locally.

I've been involved in several different cities emergency preparedness plans though, and there is actually a lot more happening in the US than most people think or know. It rarely if ever makes the news, but it happens.