Your electrical power fails due to a storm, terrorist attack, EMP or other catastrophe. Hyperinflation leads to an economic collapse and food and medical supplies stop flowing to the cities. A pandemic spreads death around the globe. These are not relatively localized disasters like hurricanes, tornadoes, wild fires, ice storms or floods, where you know help is on the way and all you have to do is hunker down and tough it out. These are nationwide...