---
title: "Plan of Iguala | New Mexico History"
description: "Plan of Iguala was the 1821 Mexican independence plan that guaranteed religion, independence, and equality, shaping New Mexico's shift from Spain to Mexico."
canonical: "https://fiveable.me/hs-new-mexico-history/key-terms/plan-of-iguala"
type: "key-term"
subject: "New Mexico History"
unit: "Unit 3"
---

# Plan of Iguala | New Mexico History

## Definition

The Plan of Iguala was the 1821 plan that ended Mexico's fight for independence from Spain. In New Mexico History, it matters because it marked the shift from Spanish rule to Mexican control.

## What It Is

The Plan of Iguala was the political agreement that helped Mexico break away from Spain in 1821, and that shift directly changed New Mexico’s status from a Spanish colony to a territory under Mexican rule. It was announced by Agustín de Iturbide and backed by Vicente Guerrero, which mattered because independence only worked if both royalists and insurgents could accept the same settlement.

The plan is usually remembered for its Three Guarantees: independence from Spain, protection of the Catholic faith, and equality for people across social classes and ethnic groups. That last point was meant to calm conflict by promising that people who had been divided under colonial rule could now belong to the same new nation. In practice, the promise of equality was easier to write down than to fully deliver, but it still gave the independence movement a unifying message.

For New Mexico, the big effect was political, not immediate local revolution. Once Mexico won independence, New Mexico stopped answering to the Spanish crown and became part of Mexico’s northern frontier. That meant new authority, new trade links, and new tensions over land, power, and local control. Students often miss that independence did not erase older colonial structures overnight, so Spanish heritage, Catholic institutions, and local elites still mattered after 1821.

The plan also points to why Mexican independence was different from earlier rebellion. It was not just a war victory, it was a negotiated settlement that brought many factions together. That is why the Plan of Iguala led so quickly to the Treaty of Córdoba and then to the short-lived Mexican Empire under Iturbide. When you see the term in New Mexico History, think of it as the moment when New Mexico’s future stopped being tied to Spain and started being shaped by Mexican national politics.

## Why It Matters

The Plan of Iguala matters in New Mexico History because it explains the handoff from Spanish rule to Mexican rule, which is one of the big turning points in the region’s timeline. If you do not know this plan, the change in New Mexico’s government can look sudden. The plan shows that independence was not only about winning a war, it was also about deciding what kind of country would replace the Spanish empire.

It also helps you track how power changed in the Southwest. After 1821, New Mexico was still a borderland, but now it was part of Mexico’s effort to govern a huge northern frontier. That shift connects to later topics like territorial autonomy, land grants, and changing trade patterns. It also helps explain why local communities kept blending Spanish, Indigenous, and Mexican traditions instead of changing all at once.

For essay questions and timeline work, the Plan of Iguala is a marker event. It sits between Spanish colonization and the later U.S. takeover, so it is one of the steps that explains how New Mexico moved from empire to nation to territory.

## Connections

### Agustín de Iturbide

Iturbide was the military and political figure who helped turn independence into a workable agreement. In New Mexico History, his leadership matters because the Plan of Iguala did not just announce independence, it also pushed a new political order that briefly became the Mexican Empire. That helps you see how independence could produce stability and instability at the same time.

### [Treaty of Córdoba](/hs-new-mexico-history/key-terms/treaty-of-cordoba)

The Treaty of Córdoba followed the Plan of Iguala and gave formal shape to Mexican independence. If the Plan laid out the goals, the treaty helped turn those goals into an official settlement. For New Mexico, that matters because it marks the point where Spanish colonial rule was ending and Mexican governance was becoming the new reality.

### [territorial autonomy](/hs-new-mexico-history/key-terms/territorial-autonomy)

The Plan of Iguala promised a unified monarchy, but New Mexico’s frontier location still gave local leaders some room to shape daily governance. That tension between central control and local autonomy shows up later in Mexican New Mexico. When you study the region, this connection helps explain why frontier provinces often had different needs than the capital.

### [Spanish Heritage](/hs-new-mexico-history/key-terms/spanish-heritage)

Spanish Heritage did not disappear when Mexico became independent. Catholic traditions, legal customs, and many elite family ties remained in place after 1821. This connection helps you avoid the mistake of treating independence as a total cultural break, because New Mexico kept many Spanish-era institutions even while its political identity changed.

## On the AP Exam

A timeline question may ask you to place the Plan of Iguala before the Treaty of Córdoba and before New Mexico’s transition from Spanish to Mexican rule. On a short-answer or essay prompt, you might use it to explain why New Mexico’s government, trade, and social hierarchy changed after 1821. If you get a document question, look for the Three Guarantees, especially independence, Catholicism, and equality, because those details show the plan’s goals. For map or regional questions, connect the plan to Mexico’s northern frontier and the way New Mexico stayed tied to larger national shifts.

## Key Takeaways

- The Plan of Iguala was the 1821 agreement that helped Mexico win independence from Spain.
- Its Three Guarantees were independence, Catholicism, and equality, which gave the movement a shared message.
- In New Mexico History, the plan matters because it marks the switch from Spanish colonial rule to Mexican rule.
- The plan did not erase older colonial structures, so Spanish heritage and local elites still shaped daily life after independence.
- It set up the Treaty of Córdoba and the short-lived Mexican Empire under Agustín de Iturbide.

## FAQs

### What is the Plan of Iguala in New Mexico History?

It is the 1821 plan that helped Mexico gain independence from Spain. In New Mexico History, it matters because New Mexico shifted from being a Spanish colony to being part of Mexico after the plan succeeded.

### What were the Three Guarantees in the Plan of Iguala?

The Three Guarantees were independence from Spain, protection of the Catholic faith, and equality for people of different social classes and ethnic backgrounds. They were meant to unite royalists and insurgents around one new political order.

### How did the Plan of Iguala affect New Mexico?

It changed New Mexico’s political status by ending Spanish colonial rule and placing the region under Mexico. That shift affected governance, trade, and local power, even though many Spanish-era customs continued.

### Is the Plan of Iguala the same as the Treaty of Córdoba?

No. The Plan of Iguala was the independence plan, while the Treaty of Córdoba was the formal agreement that confirmed Mexican independence. They are closely connected, but they are not the same document.

## Related Study Guides

- [3.1 Mexican Independence and its impact on New Mexico](/hs-new-mexico-history/unit-3/mexican-independence-impact-mexico/study-guide/bLhhC6n91Gkfetz3)

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