Sonic, America's Drive-In, originally started as a hamburger and root beer stand in 1953 in Shawnee, Okla., called Top Hat Drive-In, and then changed its name to Sonic in 1959. The first drive-in to adopt the Sonic name is still serving customers in Stillwater, Okla. Sonic has more than 3,500 drive-ins coast to coast, where approximately three million customers eat every day.