Which natural recourse became more Available to the American public as a result of the railroad expansion

The natural resource that became more available to the American public as a result of railroad expansion is coal. As a result of rail road expansion, it was discovered that coal can be used as a source of energy which was also the most cost efficient at that time.

Explanation:

The natural resource that became more available to the American public as a result of railroad expansion is coal. As a result of rail road expansion, it was discovered that coal can be used as a source of energy which was also the most cost efficient at that time.

i believe it is the second one.   if correct plz mark brainliest.

mint more silver currency sorry its probably to late.