Driving from Dallas, Texas, to San Diego, California, is a three-day drive if you stop overnight, or 19+ hours if you drive without unnecessary stops. And that'

Driving from Dallas, Texas, to San Diego, California, is a three-day drive if you stop overnight, or 19+ hours if you drive without unnecessary stops. And that's only halfway across the USA, essentially horizontally. A drive from Seattle to Miami or San Diego to Portland, Maine, would be much longer. The US Interstate Higherway System means that even on long stretches of road where nobody seems to live, the roads are still maintained, with stops every so often. And of course, no visas or even passports required. Just a driver license if you're driving, or no ID at all if you're a passenger.