McDonald's started in 1940 selling hot dogs and was franchised nationally in 1955. It now operates over 35,000 outlets in 119 countries, serving over 68 million customers daily. McDonald's dominance in the fast food industry is due to its consistency, innovation, emphasis on quality and value. However, it faces risks of health concerns reducing customers and competition offering more customization. Moving forward, McDonald's will need to focus on healthier options while controlling expansion to maintain its leading market position.