The constitution declared the independence of the 13 colonies from Great Britain and explained the transgressions placed against them by King George the third
For resources and to prove that they were powerful. Their initial holdings before WW2 were not enough to fuel the war machine it wanted to become.
The "BEST" answer for this question is......
*(A. American Landscapes <----:)
Having a railroad would make transportation of goods much easier. This would also make it safer and more efficient. There were a few risks involved but far less than transporting by conventional means.