<P> Mexican muralism was the promotion of mural painting starting in the 1920s , generally with social and political messages as part of efforts to reunify the country under the post Mexican Revolution government . It was headed by `` the big three '' painters , Diego Rivera , José Clemente Orozco and David Alfaro Siqueiros . From the 1920s to about 1970s a large number of murals with nationalistic , social and political messages were created on public buildings , starting a tradition which continues to this day in Mexico and has had impact in other parts of the Americas , including the United States where it served as inspiration for the Chicano art movement . </P>
how did the mexican revolution affect the subject matter of mexican muralists
social and political messages as part of efforts to reunify the country under the post Mexican Revolution government