The greatest change came about as a result of the Mexican Revolution, a violent social and cultural movement that defined 20th century Mexico. The Revolution produced a national sentiment that the indigenous peoples were the foundation of Mexican society. Several prominent artists promoted the "Indigenous Sentiment" ("sentimiento indigenista") of the country, including Frida Kahlo, and Diego Rivera. Throughout the twentieth century, the government established bilingual education in certain indigenous communities and published free bilingual textbooks. Some states of the federation appropriated an indigenous inheritance in order to reinforce their identity.