There is no firm consensus as to the meaning of the colours used in the Mexican National Flag, however the symbolism associated with the coat of arms is documented in history.

The Aztecs were guided by Huitzilopochtli to seek a place where an eagle lands on a prickly-pear cactus, eating a snake. When the wandering Aztecs finally saw the sign they new they had found their new home and named it 'Mexico-Tenochtitlan' (In the Moon's navel-Place of the Prickly Pear Cactus) - the city they built in 1325 is now downtown Mexico City.