I talk regularly with generals and intelligence-community leaders, and I always try to ask them what is keeping them up at night. For more than two years, nearly every single person I’ve spoken to has told me that they’re worried that foreign governments and terrorist groups are going to seize on the extraordinary technological capabilities of our day not to launch an invasion (although there will be plenty of fighting in cyberspace) but to quietly exacerbate the fractures that already divide America internally.
