Why Mexico’s flag features an eagle devouring a serpent on a cactus

History · Published 3 October 2026 Swipe more like this →

In short: The Mexican flag is more than a tricolour; it is a visual manifesto of a foundation myth. Its central emblem, depicting an eagle, a cactus, and a serpent, traces back to the 1325 prophecy that guided the Aztecs to their capital. Discover how these symbols evolved through centuries of political upheaval.

The modern Mexican flag, defined by its 4 to 7 ratio, emerged from the struggle for independence from Spain. When sovereignty was achieved in 1821, the Iguala Plan established the iconic green, white, and red tricolour. These colours were not merely aesthetic choices; they represented the 'Three Guarantees' of the new nation: green for independence, white for the Roman Catholic religion, and red for the union of the people. This compromise allowed the new state to break from Spanish rule while maintaining the existing social hierarchy, where privileged Creoles held power over the Indian majority.

At the heart of the white stripe lies the national coat of arms, a graphic representation of the Aztec foundation myth. According to legend, the founders of Tenochtitlán, now Mexico City, were searching for a predestined site for their capital. They witnessed an eagle perched on a cactus, clutching a serpent in its beak, situated on rocks amidst water. This imagery has served as a constant, albeit evolving, symbol of Mexican identity. Throughout history, various regimes have altered the emblem to reflect their specific political philosophies, such as the addition of crowns during periods of imperial rule.

The flag's design has undergone numerous official shifts since the 19th century. During the First Mexican Empire, the eagle was depicted with a crown, a feature that was removed when the first federal republic was established in 1823. The current iteration, which solidified the eagle's side-facing profile and the surrounding wreath of oak and laurel, was officially adopted on September 17, 1968. This version serves to distinguish the Mexican flag from others, such as the Italian tricolour, ensuring that the nation's unique history remains clearly visible on the world stage.

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