First Mexican Empire in the context of "Supreme Executive Power"

Mexico, officially the United Mexican States, is a country in North America. It is the northernmost country in Latin America and borders the United States to the north, and Guatemala and Belize to the southeast; while having maritime boundaries with the Pacific Ocean to the west, the Caribbean Sea to the southeast, and the Gulf of Mexico to the east. Mexico covers 1,972,550 km (761,610 sq mi), and is the thirteenth-largest country in the world by land area. With a population exceeding 130 million, Mexico is the tenth-most populous country in the world and is home to the largest number of native Spanish speakers. Mexico City is the capital and largest city, which ranks among the most populous metropolitan areas in the world.

Human presence in Mexico dates back to at least 8,000 BC. Mesoamerica, considered a cradle of civilization, was home to numerous advanced societies, including the Olmecs, Maya, Zapotecs, Teotihuacan civilization, and Purépecha. Spanish colonization began in 1521 with an alliance that defeated the Aztec Empire, establishing the colony of New Spain with its capital at Tenochtitlan, now Mexico City. New Spain became a major center of the transoceanic economy during the Age of Discovery, fueled by silver mining and its position as a hub between Europe and Asia. This gave rise to one of the largest multiracial populations in the world. The Peninsular War led to the 1810–1821 Mexican War of Independence, which ended Peninsular rule and led to the creation of the First Mexican Empire, which quickly collapsed into the short-lived First Mexican Republic. In 1848, Mexico lost nearly half its territory to the American invasion. Liberal reforms set in the Constitution of 1857 led to civil war and French intervention, culminating in the establishment of the Second Mexican Empire under Emperor Maximilian I of Austria, who was overthrown by Republican forces led by Benito Juárez. The late 19th century saw the long dictatorship of Porfirio Díaz, whose modernization policies came at the cost of severe social unrest. The 1910–1920 Mexican Revolution led to the overthrow of Díaz and the adoption of the 1917 Constitution. Mexico experienced rapid industrialization and economic growth in the 1940s–1970s, amidst electoral fraud, the Tlatelolco massacre, and economic crises. The late 20th century saw a shift towards neoliberalism, marked by the signing of the North American Free Trade Agreement (NAFTA) in 1994, amidst unrest in Chiapas.

The First Mexican Republic, known also as the First Federal Republic (Spanish: Primera República Federal), existed from 1824 to 1835. It was a federated republic, established by the Constitution of 1824, the first constitution of independent Mexico, and officially designated the United Mexican States (Spanish: Estados Unidos Mexicanos, listen). It ended in 1835, when conservatives under Antonio López de Santa Anna transformed it into a unitary state, the Centralist Republic of Mexico.

The republic was proclaimed on 1 November 1823 by the Supreme Executive Power, months after the fall of the Mexican Empire ruled by emperor Agustin I, a former royalist military officer-turned-insurgent for independence. The federation was formally and legally established on 4 October 1824, when the Federal Constitution of the United Mexican States came into force.

Central America is a subregion of North America. Its political boundaries are defined as bordering Mexico to the north, Colombia to the southeast, the Caribbean to the east, and the Pacific Ocean to the southwest. Central America is usually defined as consisting of seven countries: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, and Panama. Within Central America is the Mesoamerican biodiversity hotspot, which extends from southern Mexico to southeastern Panama. Due to the presence of several active geologic faults and the Central America Volcanic Arc, there is a high amount of seismic activity in the region, such as volcanic eruptions and earthquakes, which has resulted in death, injury, and property damage.

Most of Central America falls under the Isthmo-Colombian cultural area. Before the Spanish expedition of Christopher Columbus' voyages to the Americas, hundreds of indigenous peoples made their homes in the area. From the year 1502 onwards, Spain began their colonization. From 1609 to 1821, the majority of Central American territories (except for what would become Belize and Panama and including the modern Mexican state of Chiapas) were governed by the viceroyalty of New Spain from Mexico City as the Captaincy General of Guatemala. On 24 August 1821, Spanish Viceroy Juan de O'Donojú signed the Treaty of Córdoba, which established New Spain's independence and autonomy from mainland Spain. On 15 September, the Act of Independence of Central America was enacted to announce Central America's separation from the Spanish Empire. Some of New Spain's provinces in the Central American region were invaded and annexed to the First Mexican Empire; however in 1823 they seceded from Mexico to form the Federal Republic of Central America until 1838.

Costa Rica, officially the Republic of Costa Rica, is a country in Central America. It borders Nicaragua to the north, the Caribbean Sea to the northeast, Panama to the southeast, and the Pacific Ocean to the southwest, sharing a maritime border with Ecuador to the south of Cocos Island. It has a population of around five million in a land area of nearly 51,180 km (19,760 sq mi); the capital and largest city is San José, home to around 350,000 residents and two million people in the surrounding metropolitan area.

Humans have been present in Costa Rica since between 7,000 and 10,000 BC. Various indigenous peoples lived in the territory before it was colonized by Spain in the 16th century. Costa Rica was a peripheral colony of the Spanish Empire until independence in 1821 as part of the First Mexican Empire, followed by membership in the Federal Republic of Central America in 1823, from which it formally declared independence in 1847. The country underwent gradual modernization under relatively stable authoritarian rule until the late 19th century, when it promulgated a liberal constitution and held the first free and fair national election in Central America.

El Salvador, officially the Republic of El Salvador, is a country in Central America. It is bordered on the northeast by Honduras, on the northwest by Guatemala, and on the south by the Pacific Ocean. El Salvador's capital and largest city is San Salvador. El Salvador's population in 2024 was estimated to be 6 million.

Among the Mesoamerican nations that historically controlled the region are the Maya and then the Cuzcatlecs. Archaeological monuments also suggest an early Olmec presence around the first millennium BC. In the beginning of the 16th century, the Spanish Empire conquered the Central American territory, incorporating it into the Viceroyalty of New Spain ruled from Mexico City. However, the Viceroyalty of New Spain had little to no influence in the daily affairs of the isthmus, which was colonized in 1524. In 1609, the area was declared the Captaincy General of Guatemala by the Spanish, which included the territory that would become El Salvador until its independence from Spain in 1821. It was forcibly incorporated into the First Mexican Empire, then seceded, joining the Federal Republic of Central America in 1823. When the federation dissolved in 1841, El Salvador became a sovereign state. It then formed a short-lived union with Honduras and Nicaragua, called the Greater Republic of Central America, which lasted from 1896 to 1898.

The Federal Republic of Central America (Spanish: República Federal de Centro América), initially known as the United Provinces of Central America (Provincias Unidas del Centro de América), was a sovereign state in Central America that existed between 1823 and 1839/1841. The republic was composed of five states (Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua), and a Federal District from 1835 to 1839. Guatemala City was its capital city until 1834, when the seat of government was relocated to San Salvador. The Federal Republic of Central America was bordered on the north by Mexico, on the south by Gran Colombia and on the east by the Kingdom of Mosquitia and British Honduras, both claimed by the federal republic.

After Central America (then the Captaincy General of Guatemala) declared its independence from the Spanish Empire in September 1821, it was annexed by the First Mexican Empire in January 1822 before regaining its independence and forming a federal republic in 1823. The Federal Republic of Central America adopted its constitution, based on that of the federal government of the United States, in November 1824. It held its first presidential election in April 1825, during which liberal politician Manuel José Arce was elected as the country's first president. Arce subsequently aligned himself with the country's conservatives due to liberal opposition to the concessions he granted conservatives to secure his election as president. The republic was politically unstable, experiencing civil wars, rebellions, and insurrections by liberals and conservatives. From 1827 to 1829, it fell into a civil war between conservatives who supported Arce and liberals who opposed him. Liberal politician Francisco Morazán led the liberals to victory, and was elected president in 1830. The republic descended into a second civil war from 1838 to 1840, by the end of which the states of Central America declared independence and the federal republic ceased to exist.

The Declaration of Independence of the Mexican Empire (Spanish: Acta de Independencia del Imperio Mexicano) is the document by which Mexico declared independence from Spain’s Spanish Empire. This founding document of the Mexican nation was drafted in the National Palace in Mexico City on September 28, 1821, by Juan José Espinosa de los Monteros, secretary of the Provisional Governmental Board.

Three copies of the act were executed. One was destroyed in a fire in 1909. The other two copies are in the Museo Histórico de Acapulco Fuerte de San Diego in Acapulco and in the General Archive of the Nation in Mexico City.

The Plan of Iguala, also known as the Plan of the Three Guarantees ("Plan Trigarante") or Act of Independence of North America, was a revolutionary proclamation promulgated on 24 February 1821, in the final stage of the Mexican War of Independence from Spain. The Plan stated that Mexico was to become a constitutional monarchy, whose sole official religion would be Roman Catholicism, in which both the Peninsulares (people born in Spain and residing in Mexico) and the Americanos (people born in Mexico, that is, the Americas) would enjoy equal political and social rights. It took its name from the city of Iguala in the modern-day state of Guerrero.

The two main figures behind the Plan were Agustín de Iturbide (who would become Emperor of Mexico) and Vicente Guerrero, revolutionary rebel leader and later President of Mexico. The Army of the Three Guarantees was formed by the unified forces of Iturbide and Guerrero to defend the ideals of the Plan of Iguala. On 24 August 1821, Iturbide and Spanish viceroy Juan O'Donojú signed the Treaty of Córdoba in Córdoba, Veracruz, ratifying the Plan of Iguala, and thus confirming Mexico's independence.

The Treaty of Córdoba established Mexican independence from Spain at the conclusion of the Mexican War of Independence. It was signed on August 24, 1821 in Córdoba, Veracruz, Mexico. The signatories were the head of the Army of the Three Guarantees, Agustín de Iturbide, and, acting on behalf of the Spanish government, Jefe Político Superior Juan O'Donojú. The treaty has 17 articles, which developed the proposals of the Plan of Iguala. The Treaty is the first document in which Spanish (without authorization) and Mexican officials accept the liberty of what will become the First Mexican Empire, but it is not today recognized as the foundational moment, since these ideas are often attributed to the Grito de Dolores (September 16, 1810). The treaty was rejected by the Spanish government, publishing this determination in Madrid on February 13 and 14, 1822.