All of these are possibilities, but in each one, a thick population density will make it far worse. There's no denying that people panic when a crisis occurs, and that panic is only multiplied when more people are living closely to one another.

More people will be killed in a shorter period of time in the major cities, the roads will be clogged as people and families try to escape, and furthermore, just look at the other threats that we listed first. Many of them are directly connected to population density.

If an economic collapse were to occur, then urbanized cities would be simply unable to rebuild their economies as fast as more rural areas (with coal mining, logging, farmer's markets, etc.) could.

There are other factors that make certain areas in America unsafe and unsuitable for outlasting an apocalypse:

Strong natural disaster risks

A weak economy

High crime rates

Strict gun laws

A high cost of living

High taxes

Heavy traffic

Unfertile land for growing crops

Close proximity to nuclear/chemical power plants

Low populations of wild game and edible plants

Limited fresh water

In this story, we're going to list out the five very worst retreat areas in the United States. These are the areas where you will definitely not want to be when disaster strikes, and if you live in or near any of these areas now, you may want to consider moving or have an alternate plan: