Western United States

I plan on traveling to most of the states west of the Mississippi River that I and/or my girl friend have not yet had the opportunity to visit.  We will attempt to visit the following states by automobile: Utah, Idaho, Oregon, Washington, Montana, Wyoming, South Dakota, North Dakota, Minnesota, Wisconsin, Iowa, Nebraska, Kansas, Missouri, Arkansas, and Oklahoma.  We have already visited Texas, New Mexico, Arizona, California, Nevada, Colorado, and Hawaii.