Wheels of Progress, cool old 50's movie you probably saw in grade school on a reel to reel projector

the meager start of improved highways. Above, you can see that the Lincoln highway seems to go from Boston to San Francisco. That wasn't planned until 1913, and not accomplished until around 1916

20 years later

 and 20 after that.

In just 40 years roads were thoroughly accessed throughout the USA. This is before the Eisenhower Interstate System