The period that Obregón had been elected to serve, between 1928 and 1934, was when Calles became the "Jefe Máximo", the "maximum chief," and the power behind the presidency. It was a title he never used for himself. The period is known as the "Maximato" (1928–1934), with many regarding Emilio Portes Gil, Pascual Ortiz Rubio, and Abelardo Rodríguez as puppets of Calles. Officially, after 1929, Calles served as minister of war, as he continued to suppress the Cristero War, but a few months later, after intervention of the United States ambassador Dwight Morrow, the Mexican government and the Cristeros signed a peace treaty. During the Maximato, Calles became increasingly authoritarian and would also serve as Minister of Industry and Commerce. In the early 1930s, he appears to have flirted with the idea of implementing aspects of fascism in the government, and the ideology clearly had an influence on him.