The Cry of Dolores, September 15, 1810
The Cry of Dolores is an expression associated with the 1810 Mexican revolt against the Spanish, a cry of sorrow and anger from a priest credited with beginning Mexico's struggle for independence from colonial rule.
https://www.thoughtco.com/mexican-independence-the-cry-of-dolores-2136414
The current coat of arms of Mexico (Spanish: Escudo Nacional de México, literally "national shield of Mexico" ) has been an important symbol of politics and culture of Mexico for centuries. The coat of arms depicts a Mexican golden eagle perched on a prickly pear cactus devouring a rattlesnake. The design is rooted in the legend that the Aztec people would know where to build their city once they saw an eagle eating a snake on top of a lake. To the people of Tenochtitlan, this symbol had strong religious connotations, and to the Europeans, it came to symbolize the triumph of good over evil (with the snake sometimes representative of the serpent in the Garden of Eden).
https://en.wikipedia.org/wiki/Coat_of_arms_of_Mexico