Tlatelolco massacre in the context of Mexican Armed Forces

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 1968 Summer Olympics (Spanish: Juegos Olímpicos de Verano de 1968), officially known as the Games of the XIX Olympiad (Spanish: Juegos de la XIX Olimpiada) and officially branded as Mexico 1968 (Spanish: México 1968), were an international multi-sport event held from 12 to 27 October 1968, in Mexico City, Mexico. These were the first Olympic Games to be staged in Latin America, the first to be staged in a Spanish-speaking country, and the first to be staged in the Global South. Consequently, these games also marked the first time that there would be a gap of two Olympic Games not to be held in Europe. They were also the first Games to use an all-weather (smooth) track for track and field events instead of the traditional cinder track, as well as the first example of the Olympics exclusively using electronic timekeeping equipment.

The 1968 Games were the third to be held in the last quarter of the year, after the 1956 Games in Melbourne and the 1964 Games in Tokyo. The 1968 Mexican Student Movement was crushed days prior, hence the Games were correlated to the government's repression.

Luis Echeverría Álvarez (Spanish pronunciation: [ˈlwis etʃeβeˈri.a ˈalβaɾes]; 17 January 1922 – 8 July 2022) was a Mexican lawyer, academic, and politician affiliated with the Institutional Revolutionary Party (PRI) who served as the 57th president of Mexico from 1970 to 1976. Previously, Echeverría was Secretary of the Interior from 1963 to 1969. He was the longest-lived president in Mexican history and the first to reach the age of 100.

Echeverría was a long-time CIA asset, known by the cryptonym, LITEMPO-8. His tenure as Secretary of the Interior during the Díaz Ordaz administration was marked by an increase in political repression. Dissident journalists, politicians, and activists were subjected to censorship, arbitrary arrests, torture, and extrajudicial killings. This culminated with the Tlatelolco massacre of 2 October 1968, which ruptured the Mexican student movement; Díaz Ordaz, Echeverría, and Secretary of Defense Marcelino Garcia Barragán have been considered as the intellectual authors of the massacre, in which hundreds of unarmed protestors were killed by the Mexican Army. The following year, Díaz Ordaz appointed Echeverría as his designated successor to the presidency, and he won in the 1970 general election.