Mexico and Central America: Native Peoples, 1900 a.d.–present

• ca. 1905 The Mexican government initiates archaeological excavations at the site of Teotihuacan. Led by the archaeologist Leopoldo Batres (1852–1926), the Pyramid of the Sun is excavated and restored.

• 1910 The Revolution begins in Mexico. Revolutionaries throughout the country take up arms, among them Emiliano Zapata (1879–1919) in the south and Pancho Villa (1878–1923) in the north.

• ca. 1913 The eminent archaeologist Manuel Gamio (1883–1960) excavates a portion of the Templo Mayor, the main temple in Tenochtitlan.

• 1915 Physician and novelist Mariano Azuela (1873–1952) publishes Los de abajo (The Underdogs) in Mexico, chronicling the exploitation of indigenous people at the hands of government troops during the Revolution.

• 1917 The Constitution of Querétaro, still in force today, is passed in Mexico. Article 27 decrees the return of communal lands, known as ejidos, to indigenous communities and calls for education of the rural population.

• 1926 The anticlerical government in Mexico closes many monasteries, convents, and church schools, and prohibits religious processions.

• ca. 1927 The Mexican government commissions Diego Rivera (1886–1957) to paint murals on corridors and staircases in the National Palace in Mexico City; they depict Mexican life and history from Precolumbian times to the Revolution.

• 1929 The National Revolutionary Party (PNR), the precursor of the Institutional Revolutionary Party, known as PRI, is founded in Mexico.

• 1930–31 The exhibition Mexican Arts, organized by the American Federation of Arts, presents some 1,000 mostly contemporary works of art at the Metropolitan Museum in New York and seven other major museums in the United States.

• 1932 An uprising by Indian workers in the coffee plantations of El Salvador ends in the death of thousands at the hands of the army and paramilitary groups in league with landowners. Known as La Matanza (The Massacre), the event consolidates the military regime in El Salvador which remains through the 1970s. Many Indians relinquish all appearance of indigenous culture.

• 1932 At Monte Albán in Oaxaca, the tomb of a Mixtec dignitary is discovered by Mexican archaeologist Alfonso Caso (1896–1970). Interred between the thirteenth and fifteenth century, the tomb is one of the richest burials ever unearthed in the Americas, containing quantities of jewelry made of precious materials, including large numbers of gold ornaments.

• 1940 The exhibition Twenty Centuries of Mexican Art opens at the Museum of Modern Art in New York. Hundreds of artworks in all media are lent by Mexico to illustrate artistic developments from Precolumbian to modern times.

• 1952 Yuri Knorosov (1922–1999), a Russian epigrapher, demonstrates that Maya hieroglyphic writing is composed of logographs (signs standing for entire words) and phonetic syllables.

• 1952 The tomb of the Maya ruler K'inich Janaab' Pakal I (Sun Shield) (r. 615–83), buried deep inside the Temple of the Inscriptions at Palenque, is discovered by the Mexican archaeologist Alberto Ruz Lhuillier (1906–1979).

• 1960 The Russian-American scholar Tatiana Proskouriakoff (1909–1985) proves that the inscriptions carved on Maya stone monuments record dates and events in the lives of named rulers and their families.

• 1960 The Zapotec artist Francisco Toledo (born 1940), moves to Paris after studying graphic art and design in Oaxaca and Mexico City. He works with the renowned British printmaker Stanley William Hayter and travels extensively throughout Europe.

• 1964 The Mexican National Museum, now called Museo Nacional de Antropología, is enlarged and inaugurated. Gallery displays document ancient Mesoamerican cultures and contemporary indigenous groups.

• 1965 Francisco Toledo (born 1940) returns to his native Oaxaca from Europe. His remarkable creative imagination is expressed in paintings, graphic art, sculpture, weaving, and pottery.

• 1967 The Guatemalan writer Miguel Ángel Asturias (1899–1974) is awarded the Nobel Prize for literature. His writing is rooted in the traditions and history of indigenous peoples in Guatemala.

• 1968 Demonstrations against the suppression of civil liberties take place in Mexico City's Zócalo (main square). More than half a million people gather.

• 1969 More than 700 pieces of Mexican folk art collected by Nelson A. Rockefeller are exhibited at the Museum of Primitive Art in New York.

• ca. 1978 Guatemala is shaken by revolutionary civil war which lasts through 1985. Marxist guerrillas, joined by Maya groups, challenge the military state.

• 1978 The monumental, finely carved relief sculpture of the Aztec moon goddess Coyolxauhqui is accidentally discovered by workers near the Cathedral in Mexico City. Thousands of archaeological objects are recovered in the four years of excavation around the Templo Mayor that follow; many are now exhibited in the Museo del Templo Mayor, located adjacent to the excavation site.

• 1994 The North American Free Trade Agreement, known as NAFTA, goes into effect on January 1. A peasant uprising in the state of Chiapas in southern Mexico begins the same day. Demands are made for land reform and social justice, but further impoverishment of Mexico's indigenous population occurs.