Flags of Mexico

United Mexican States (modern)

Who & why: the Mexican Revolution (1910–1920), a sweeping and costly conflict against Porfirio Díaz's long dictatorship and its successors, produces the progressive 1917 Constitution that still governs Mexico today. The eagle emblem is refined again in 1968, ahead of the Mexico City Olympics, into its current, more naturalistic form.

What it represents: green (independence), white (the Catholic religion, historically; today unity), and red (the union of European and Indigenous peoples, historically; today the martyrs' blood) frame the founding eagle-and-cactus-and-serpent emblem from the Mexica migration legend.

Restored Republic, the Porfiriato & the Revolution

Who & why: Benito Juárez restores the republic after Maximilian's execution in 1867, followed by Porfirio Díaz's long, modernizing but increasingly authoritarian rule (the "Porfiriato," 1876–1911). Díaz's fall triggers the Mexican Revolution (1910–1920), a prolonged and often violent struggle involving figures like Francisco Madero, Pancho Villa, and Emiliano Zapata that reshapes Mexican society and eventually produces the 1917 Constitution.

What it represents: the tricolor continues through this turbulent half-century with only minor emblem revisions, shown here as one bridging entry across a genuinely fast-changing and consequential period.

Second Mexican Empire

Who & why: France, seeking to collect Mexican debts and exploit its own internal Liberal-Conservative conflict, invades in 1862 (defeated at first at the Battle of Puebla, 5 May, now Cinco de Mayo) and installs Austrian Archduke Maximilian as emperor in 1864. President Benito Juárez's republican government never surrenders, waging continued resistance until French troops withdraw and Maximilian is captured and executed by firing squad in 1867.

What it represents: the same green-white-red tricolor, with four golden eagles added to the corners marking Maximilian's imperial (rather than republican) government.

First Federal & Centralist Republics

Who & why: a republic replaces Iturbide's short-lived empire in 1823, but the decades that follow are genuinely turbulent: repeated swings between federalist and centralist constitutions, Texas's 1836 secession, and the disastrous 1846–48 Mexican-American War, which ends with Mexico ceding roughly half its national territory to the United States under the Treaty of Guadalupe Hidalgo.

What it represents: the same tricolor structure as the empire, with the crown removed from atop the eagle to mark republican rather than monarchical government, shown here as one bridging entry across a genuinely fast-changing 41 years.

First Mexican Empire

Who & why: Mexico wins independence from Spain in September 1821 after an 11-year war beginning with Miguel Hidalgo's 1810 revolt; Agustín de Iturbide, architect of the final independence pact, has himself proclaimed emperor in 1822, but growing republican opposition forces his abdication within less than two years.

What it represents: the first Mexican tricolor, designed under the 1821 Plan of Iguala — green, white, and red for independence, religion, and unity — centered on a crowned eagle perched on a cactus, referencing the Mexica founding legend of Tenochtitlan.

Viceroyalty of New Spain

Who & why: Hernán Cortés, aided by Indigenous allies resentful of Aztec rule and by a devastating smallpox epidemic, completes the conquest of Tenochtitlan in August 1521, ending the Aztec Empire and founding Mexico City on its ruins. Nearly three centuries of Spanish colonial rule follow as the Viceroyalty of New Spain, marked by the fusion (and frequently forced imposition) of Spanish, Catholic, and Indigenous cultures, and by a war of independence that begins with Miguel Hidalgo's 1810 Grito de Dolores.

What it represents: the Cross of Burgundy (a red saltire on white), the common flag of the Spanish Empire's overseas viceroyalties, flown across New Spain's territory for most of this colonial period.

Aztec (Mexica) Empire

Who & why: the Mexica people found Tenochtitlan in 1325 on a lake island, guided (per their founding legend) by the sight of an eagle devouring a serpent atop a cactus — the same emblem still on Mexico's flag today. By the early 1500s Tenochtitlan is one of the largest cities on Earth, anchoring an empire covering much of central Mexico, until Hernán Cortés's Spanish-led conquest (aided by Indigenous rivals of the Aztecs and by smallpox) topples it in 1519–1521.

What it represents: no flag in the European heraldic sense existed in Mesoamerica; Aztec military and religious standards (often feathered devices carried on the back) served a related signaling purpose. Shown here as an informed reconstruction of the eagle-cactus-serpent founding emblem on a plain field, not a documented banner, since the true device would not have taken this rectangular flag form.

Olmec and Pre-Aztec Mesoamerican Civilizations

Who & why: the Olmec, centered at San Lorenzo (from c. 1500 BCE) and later La Venta in Mexico's Gulf Coast lowlands, are Mesoamerica's earliest major civilization and are widely regarded by archaeologists as its foundational "mother culture" — the source of artistic, religious, and political patterns (including the colossal carved stone heads for which they are best known) that reappear across every later Mesoamerican civilization. After Olmec decline by around 400 BCE, the torch passes in turn to Teotihuacan (whose Pyramid of the Sun rises around the 1st–2nd century CE, and whose city grows to perhaps 100,000 people at its peak before collapsing around 550 CE), the Classic Maya city-states of the southern lowlands (Tikal, Palenque, Copán, flourishing especially 250–900 CE), and the Toltec at Tula (c. 900–1150 CE), whom the Mexica themselves later claimed as their civilizational model. Tenochtitlan's founders inherit this millennia-deep Mesoamerican tradition rather than starting one from scratch.

What it represents: no flag or banner in any modern sense survives, or was likely ever created, by any of these civilizations — shown here honestly blank. Olmec rulers are depicted on stone monuments with rank regalia rather than flags; Teotihuacan and the Classic Maya used painted murals, carved stelae, and elite costume to signal authority and identity instead.

World context: Olmec San Lorenzo rises as Egypt's New Kingdom is winding down and as Shang-dynasty China is inscribing its earliest oracle-bone writing; La Venta's peak overlaps the traditional 753 BCE founding of Rome. Teotihuacan's height in the 4th–5th centuries CE runs alongside Rome's fall in the west (476 CE), and its collapse around 550 CE is roughly contemporary with the Maya Classic city-states' own rise; those Classic Maya centers flourish through the same centuries as the early Islamic caliphates' rapid expansion and Tang-dynasty China, and the Toltec capital of Tula falls at almost exactly the moment the Crusader states are being founded in the eastern Mediterranean.