The history of Mexico, a country located in the southern portion of North America, covers a period of more than two millennia. First populated more than 13,000 years ago, the country produced complex indigenous civilizations before being conquered by the Spanish in the 16th Century.

Since the Spanish Conquest, Mexico has fused its long-established native civilizations with European culture. Perhaps nothing better represents this hybrid background than Mexico's languages: the country is both the most populous Spanish-speaking country in the world and home to the largest number of Native American language speakers on the continent.

From 1519, the Spaniards absorbed the native peoples into Spain's vast colonial empire. For three centuries, Mexico was a colony, during which time its indigenous population fell by more than half. After a protracted struggle Mexico declared its independence from Spain in 1810. In 1846, the Mexican American War broke out, ending two years later with Mexico ceding almost half of its territory to the United States. Later in the 19th century, France invaded Mexico (1861) and set Maximilian I on the Mexican throne, which lasted until 1867. The Mexican Revolution (1910–1929) resulted in the death of 10 percent of the nation's population, but brought to an end the system of large landholdings that had originated with the Spanish Conquest.

Mexico (ⁱ/ˈmɛksɨkoʊ/; Spanish: México, IPA: [ˈmexiko] ( listen)), officially the United Mexican States (Spanish:  Estados Unidos Mexicanos (help·info)), is a federal constitutional republic in North America. It is bordered on the north by the United States of America; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of Mexico. Covering almost two million square kilometres (over 760,000 sq mi), Mexico is the fifth largest country in the Americas by total area and the thirteenth largest independent nation in the world. With an estimated population of over 113 million, it is the eleventh most populous country and the most populous Spanish-speaking country. Mexico is a federation comprising thirty-one states and a Federal District, the capital city.

In Pre-Columbian Mexico many cultures matured into advanced civilizations such as the Olmec, the Toltec, the Teotihuacan, the Zapotec, the Maya and the Aztec before the first contact with Europeans. In 1521, Spain conquered and colonized the territory from its base in México-Tenochtitlan, which was administered as the Viceroyalty of New Spain. This territory would eventually become Mexico as the colony's independence was recognized in 1821. The post-independence period was characterized by economic instability, the Mexican-American War and territorial cession to the United States, a civil war, two empires and a domestic dictatorship. The latter led to the Mexican Revolution in 1910, which culminated with the promulgation of the 1917 Constitution and the emergence of the country's current political system. Elections held in July 2000 marked the first time that an opposition party won the presidency from the Institutional Revolutionary Party.

The Mexican Revolution (Spanish: Revolución mexicana) was a major armed struggle that started in 1910, with an uprising led by Francisco I. Madero against longtime autocrat Porfirio Díaz, and lasted for the better part of a decade until around 1920. Over time the Revolution changed from a revolt against the established order to a multi-sided civil war. This armed conflict is often categorized as the most important sociopolitical event in Mexico and one of the greatest upheavals of the 20th century.

After prolonged struggles, its representatives produced the Mexican Constitution of 1917. The Revolution is generally considered to have lasted until 1920, although the country continued to have sporadic, but comparatively minor, outbreaks of warfare well into the 1920s. The Cristero War of 1926 to 1929 was the most significant relapse into bloodshed.

The Revolution led to the creation of the Partido Nacional Revolucionario ("National Revolutionary Party") in 1929; it was renamed the Partido Revolucionario Institucional (Institutional Revolutionary Party) (PRI) in 1946. Under a variety of leaders, the PRI held power until the general election of 2000.

Mexican Americans are Americans of Mexican descent. As of July 2009, Mexican Americans make up 10.3% of the United States' population with over 31,689,000 Americans listed as of Mexican ancestry. Mexican Americans comprise 66% of all Hispanics and Latinos in the United States. The United States is home to the second largest Mexican community in the world second only to Mexico itself comprising nearly 22% of the entire Mexican origin population of the world. Canada is a distant third with a Mexican origin population of 37,000 as of 2001 although increasing to 61,505 as of 2006. In addition, as of 2008 there were approximately 7,000,000 undocumented Mexicans living in the United States which if included in the count would increase the US share to over 28% of the world's Mexican origin population (Note that some of the undocumented would be captured in the US Census count depending on their willingness to provide information). Over 60% of all Mexican Americans reside in the states of California and Texas. Most Mexican Americans are the descendants of the Indigenous peoples of Mexico and/or Europeans, especially Spaniards.