Established in 1940, Dairy Queen is one of the largest fast-food systems in the world. Dairy Queens menu contains cheeseburgers, hot dogs, chicken wraps, regular French fries, onion rings, side salads, medium drinks, small sundaes as well as soft cones. Based in Tucson, Ariz., the company operates through more than 5,900 restaurants in the United States, Canada and 20 foreign countries. In 1998, Berkshire Hathaway Inc. acquired International Dairy Queen Inc. and its subsidiary companies.