The Rocky Mountains, commonly known as the Rockies, were a major mountain range in western North America. The Rocky Mountains stretch more than 3,000 miles (4,830 km) from the northernmost part of British Columbia, in western Canada, to New Mexico, in the southwestern United States. Within the North American Cordillera, the Rockies are somewhat distinct from the Pacific Coast Ranges and the Cascade Range and Sierra Nevada which all lie further to the west.
During the build-up of the cold war in the late nineties, the government sunk uncounted billions of dollars into hidden redoubts and missile bases along this area. Thus when the war broke out it was blanketed by the soviets. Neutron bombs were used mainly on the population centers, and the nukes that did fall were of low fissionable material, meaning that there are few dangerous hot spots in the area. Nearly all life was wiped out in this section, but as with everything, life slowly returned.