By the 1920s, the emerging middle and working classes were powerful enough to elect a reformist president, Arturo Alessandri, whose program was frustrated by a conservative congress.
Ipak, srednja i radnička klasa ojačale su do 1920-ih dovoljno da bi mogle izabrati reformski orijentiranog predsjednika, Artura Alessandija Palmu, čiji je program djelomično blokirao konzervativni kongres.