The distance from Jacksonville, Florida to Los Angeles, California is about 3888 km. The earth’s circumference is about 40 000 km (source), so the US spans about 10% of that, roughly :)

The distance from Jacksonville, Florida to Los Angeles, California is about 3888 km. The earth’s circumference is about 40 000 km (source), so the US spans about 10% of that, roughly :)

Sure, and that’s demonstrated pretty well elsewhere here in Australia.
But that’s reasonably straight for what’s being measured here and not the full breadth of the US. Going from the most extreme points in Maine to California, gives you a distance of 4600 km. Since we’re effectively on a sphere, there’s no particular reason that line needs to follow the latitudinal lines.