 Surveys in 1874, 1875, and 1876 helped spark the Great Sioux War of 1876.The transcontinental NPR was completed on September 8, 1883, at Gold Creek.Tracks of the Great Northern Railroad (GNR) reached eastern Montana in 1887 and when they reached the northern Rocky Mountains in 1890, the GNR became a significant promoter of tourism to Glacier National Park region.