EMP: Not if, but when
As the chief of staff of the congressional EMP commission for 17 years, he notes a number of concerns. Aircraft would fall from the sky and automobiles would fail to start. Water would no longer be available in homes. "We only have enough food to feed 326 million people for 30 days and the food would begin to spoil within 72 hours."
Should a nationwide blackout occur for as long as a year, the EMP commission reports "90% of our population could starve to death, die from disease and societal chaos, and collapse."