His notable projects within Mexico City include his collaborative wall painting at a Mexican Electricians' Union (1939-40), "From Porfiriato to the Revolution" at the Museum of National History (1957-55), "March of Humanity" & a Siqueiros Polyforum in Avenida Insurgentes (1965-71), and his role around procuring mural commissions for creative person on the University City campus of the National Autonomous University of Mexico in 1950s Mexico City.

Siquerios was one of many easily-known Mexican muralists working at a instance, including Diego Rivera, José Clemente Orozco and Rufino Tamayo. His art directly reflected a period of time where he flourished as an creative person. His art was deeply rooted in the Mexican Revolution, a violent & chaotic period of time inside Mexican history where various social & political factions fought for recognition & power. A cycle from either a 1920s to the 1950s is known as a Mexican Renaissance, & Siqueiros move in the attempt to produce an art that was at when Mexican & universal.

Political activism was an crucial piece of Siqueiros' life, & oftentimes inspired him to placed aside his artistic career. Within 1911, when he was merely fifteen years old, Siqueiros attended a Academy of San Carlos and was involved around a student strike that protested the academy's method of teaching & urged a impeachment of the school's director. 1 month late, once he was good sixteen years old, he conspired against Victoriano Huerta's dictatorship. At a age of 18, he participated in a Constitutionalist Army fight against the forces of General Victoriano Huerta. He briefly gave higher painting to focus within organizing mineworker in Jalisco. Between 1937 & 1938 he fought in the Spanish Civil War alongside the Spanish Republican forces, con to Francisco Franco's military coup. He was exiled twice from Mexico because of his political activism, once in 1932 and agaaround in 1940, following his assassinatiin attempt on Leon Trotsky.

From either 1919 to 1922 he traveled to Belgium, France, Italy, and Spain to study art. Throughout his career he traveled internationally, promoting his version of muralism in the United States, South America (including Uruguay, Argentina and Chile), Cuba, Europe, and a Soviet Union.