From a neighborhood restaurant established in Des Plaines, Illinois in 1955 to today, more than 30,000 restaurants in more than 100 countries worldwide, McDonald's is the largest quick service restaurant organization in the world.

McDonald's recognized that to be successful, it would have to be flexible and adapt to societal changes. In 1975, McDonald's opened its first drive-thruTM window in Sierra Vista, Arizona to accommodate a more mobile society.

The company realized there was a need for a fast, quality morning meal and in 1973, the Egg McMuffinTM was introduced.