After the Mexican Revolution, an art movement emerged that developed through the 1930s with the clear goal of bringing art to the people: the muralists.
The murals often had critical social content, and most of the muralistas were politically engaged. Diego Rivera is probably the best known, other leading names are David Alfaro Siqueiros and José Clemente Orozco.
You can see the works of Diego Rivera in several places, among others his wonderful illustrations of the Mexican history at the Palacio Nacional in Ciudad de México.
Muralistas mexicanas de hoy
Muralism continues today as Arte Urbano (Street Art) and draws motifs from both Native Mexican mythology and the world today. The murals can vary in artistic value but are usually conveying a message. The examples are from the island of Cozumel, where the murals comment on the impact of tourism on the island's ecosystems, not least the coral reef, or in Chiapas, where they link Native Mexican mythology and political activism.