Without Electricity... Can You Live Like It's 1880!? 

THE MOST SERIOUS THREAT WE FACE IS...
The Power Grid being hacked and disabled if at war.

“If the grid went down for a long enough time…
  90 percent of the U.S. population would die  from starvation, lack of water, and social disruption.  We are talking about total devastation.”
-- Ambassador Henry Cooper, Former Director of U.S. Strategic Defense