The discovery of gold and silver led to the need for railroads throughout the united states.

Thats true because when the settlers found out that there was gold they needed a easier way to travel there.

Concurrent jurisdiction is the ability to exercise judicial review by different courts at the same time, within the same territory, and over the same subject matter. for instance, a domestic violence matter may be heard in either a general civil court or a family court in the same county.i hope that this you : )