Which of the following was an effect of the discovery of gold and silver on western development?

Question

It caused a sharp decrease in the population of eastern cities.
It caused a sharp decrease in the population of eastern cities.

There was no longer a need for the railroad.
There was no longer a need for the railroad.

The value of gold and silver decreased.
The value of gold and silver decreased.

It contributed to the opening of the western frontier.

Answer 1

It contributed to the opening of the western frontier.