Who did the US Government support after gold was discovered on the Nez Perce reservation?

The US Government supported white settlers and prospectors who flocked to the Nez Perce reservation after gold was discovered there in 1860. This ultimately led to conflict between the Nez Perce people and the US Government, culminating in the Nez Perce War of 1877.

did they move the Nez Perce off thier land?

Yes, after the discovery of gold on their land, the US Government pressured the Nez Perce to cede a significant portion of their territory through a series of treaties. This ultimately led to the Nez Perce being forced to leave their ancestral lands and move to a reservation in Idaho. The Nez Perce War of 1877 was a result of their resistance to being moved off their land.