Diego Rivera held several themes in his artwork, including social inequality, industry, technology, history, and the relationship between nature and Mexico. He developed an interest in painting from a young age and studied traditional European styles as well as the influence of Mexican folk artist Jose Guadalupe Posada. Rivera's murals often narrated the social history and politics of Mexico as part of the country's mural movement in the 1920s. He painted large-scale murals both in Mexico and the United States.