Fargo is the largest city in North Dakota and the seat of Cass County. It is the focus of a metropolitan statistical area that extends over Cass County, North Dakota, and Clay County, Minnesota, where Fargo's sister city, Moorhead, is located. Founded by the Northern Pacific Railway, the city was an important transportation and marketing point for the surrounding fertile wheat-growing region. Today it is an agri-business and agricultural research center. Money Magazine consistently ranks Fargo among the nation's most livable small cities, noting that it is a safe city and a "booming regional center for health care and financial services." The city has been declared a "Great Plains success story, with locally grown high-tech firms and a state university" by Kiplinger's Personal Finance Magazine.