which region of the country has the greatest concentration of railroad lines? northeast northwest southeast…

which region of the country has the greatest concentration of railroad lines? northeast northwest southeast southwest which region seemed to provide the greatest obstacle to railroad expansion? the great lakes the appalachians the mississippi river the rocky mountains

which region of the country has the greatest concentration of railroad lines? northeast northwest southeast southwest which region seemed to provide the greatest obstacle to railroad expansion? the great lakes the appalachians the mississippi river the rocky mountains

Answer

Brief Explanations:

  • For the first question, historically and due to population density and economic activity, the Northeast has a high - density of railroad lines.
  • For the second question, the Rocky Mountains presented significant challenges in terms of terrain, elevation, and engineering difficulties for railroad expansion.

Answer:

  1. Northeast
  2. The Rocky Mountains