Is the U.S. the nation most vulnerable to cyberattack?

Several nations, most prominently Russia, the People’s Republic of China and North Korea, are already assembling cyber armies and attack weapons that could be used to attack other nations. Given that the United States is heavily dependent on technology for everything from computer-based banking to supply-chain tracking and air-traffic control, it’s particularly vulnerable to the denial-of-service attacks, electronic jamming, data destruction and software-based disinformation tricks likely in a cyberattack.