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.

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