The Mexican Revolution was a major armed struggle, lasting roughly from 1910 to 1920, that transformed Mexican culture and government. Although recent research has focused on local and regional aspects of the Revolution, it was a genuinely national revolution. Its outbreak in 1910 resulted from the failure of the 31-year-long regime of Porfirio Díaz to find a managed solution to the presidential succession. This meant there was a political crisis among competing elites and the opportunity for agrarian insurrection.