History Of National Margarita Day The Margarita’s origin is shrouded in mystery and competing claims. In 1938, Carlos “Danny” Herrera reportedly created it in Baja California for Marjorie King, a dancer allergic to all spirits but tequila. Alternatively, bartender Francisco “Pancho” Morales claimed he mixed the first Margarita in Juárez, Mexico in 1942, a claim supported by the Mexican newspaper Notimex.