 Political repression and fraud, as well as huge income (in)equalities exacerbated by the land distribution system based on "latifundios", in which large haciendas were owned by a few but worked by millions of underpaid peasants living in precarious conditions, led to the Mexican Revolution (1910–1920), an armed conflict that drastically transformed Mexico's political, social, cultural, and economic structure during the twentieth century under a premise of social democracy.The war itself left a harsh toll on the economy and population, which decreased over the 11-year period between 1910 and 1921.The reconstruction of the country was to take place in the following decades.