C) Western expansion spread the U.S population over a wider area.
The factor that helped the United States in making the inland transportation and commerce to be possible is in letter C. The intricate river system. I hope you are satisfied with my answer and feel free to ask for more if you have clarifications and questions.
Evaporation have a nice day!
Latitude and longitude <span>have been used as a grid measurement system for navigating the earth for hundreds of years.
Hope this helps !
Photon</span>
