How did the discovery of gold influence events leading up to chief joesph's war

The discovery of gold and mining on the West led to a railroad boost as more and more people were moving there in the hopes of becoming rich. The growth the West was experiencing ultimately led to the Federal Government pressuring the Nez Perce (natives of Wallowa Valley) to give up their homeland to them. Natives followed their tribe leader, Chief Joseph, and refused to be forced onto a reservation, so they walked for 1400 miles attempting to reach Canada, but meeting their sad end when they encountered the US Army and battled them in the Nez Perce War.

one of the main reasons was definitely slavery. back in 1861, republican abraham lincoln was elected and ended up being a major influence in the slavery business. slavery greatly affected the texas economy because back in 1845 during the annexation of texas, slaves became a big part of the texas population. many texans that were in favor of the secession influenced groups through party ties.

what class is this for i can then