Viva Mexico! Add this beautiful shield of Mexico to your backdrop at your next 5 de Mayo or Mexican Independance day - Día de la Independencia is aMexican holiday to celebrate the “cry of independence” on September 16, 1810, which started a revolt against the Spaniards. It follows from the day of the Cry of Dolores (El Grito de Dolores), on September 15.. The coat of arms of Mexico is one of the three symbols that represent the Mexican nation, along with the flag and the national anthem. The coat of arms of the United Mexican States, as it is officially known, is inspired by the legend of the founding of Mexico City-Tenochtitlan in a mythical past.