Final answer:
Los Tres Grandes, artists of the Mexican muralism movement, rejected European gallery art in favor of creating public murals with social and political messages post the Mexican Revolution, influencing the Mexican Renaissance and art in the U.S.
Step-by-step explanation:
The movement of Mexican muralism that developed after the Mexican Revolution was influenced heavily by the works of Los Tres Grandes: David Alfaro Siqueiros, Diego Rivera, and José Clemente Orozco. These artists sought to break away from the imported European art styles that dominated Mexico before the revolution, and instead produced public murals that conveyed social and political messages, educated the masses, and depicted images of the nation's past. Siqueiros, Rivera, and Orozco, each with their unique artistic expression, created murals in public buildings that reached a wider audience, unlike the restricted gallery art. Their commitment to art that depicted social issues and the life of the working class made them pivotal figures in the Mexican Renaissance, influencing the art movement not only in Mexico but also in the United States during the era of the WPA (Works Progress Administration).