Situated on bluffs overlooking the Mississippi River, Memphis, Tennessee, has historically served as a commercial and social center for western Tennessee, northern Mississippi, and eastern Arkansas, and is considered by many to be the true capital of the Mississippi River delta. The city's rich history includes eighteenth-century French and Spanish forts, colorful riverboat traffic, and a driving economic force—cotton. The city numbers barbecue cooking among its contributions to the national culture and calls itself "Home of the Blues" and "Birthplace of Rock 'n Roll." A five-time winner of the "Nation's Cleanest City" award, Memphis boasts a high quality of life enhanced by a pleasant climate, top-notch schools, and abundant recreational opportunities. Already a distribution hub and headquarters for leaders in services such as hotels and package express, Memphis proceeded through the end of the twentieth century with a technological focus on agribusiness and health care. Today, its Memphis Medical Center and St. Jude Children's Hospital are leaders in research and medical care, and the city continues to be an important commercial center; despite its development, Memphis retains an unhurried approach to life and remains close to its musical roots.