There are also claims that the margarita was first mixed in Juárez

There are also claims that the margarita was first mixed in Juárez, Mexico at Tommy’s Place Bar on July 4, 1942 by Francisco “Pancho” Morales. Morales later left bartending in Mexico to become a US citizen, where he worked as a milkman for 25 years. Mexico’s official news agency Notimex and many experts have said Morales has the strongest claim to having invented the margarita.6

Others say the inventor was Dallas socialite Margarita Sames, when she concocted the drink for her guests at her Acapulco vacation home in 1948. Tommy Hilton reportedly attended, bringing the drink back to the Hilton chain of hotels. However, Jose Cuervo was already running ad campaigns for the margarita three years earlier, in 1945, with the slogan, “Margarita: It’s more than a girl’s name.” According to Jose Cuervo, the cocktail was invented in 1938 by a bartender in honor of Mexican showgirl Rita de la Rosa.78

The Balinese Room
Another common origin tale begins the cocktail’s history at the legendary Balinese Room in Galveston, Texas where, in 1948, head bartender Santos Cruz created the margarita for singer Peggy (Margaret) Lee. He supposedly named it after the Spanish version of her name, Margarita, and it has been a hit ever since. (Margarita is a German form of the name and was introduced to Mexico with no Hispanic origin.)910