for Cárdenas's political rivals, former presidents Plutarco Elías Calles and Abelardo L. Rodríguez. When Cárdenas was governor of his home state of Michoacan (1928–32) and later, when he was president of Mexico (1934–40) and beyond, he promoted tourism to Michoacan and particularly to the historic town of Pátzcuaro. He commissioned murals to show the importance of the region's history to the history of Mexico, promoted indigenous performance in music and dance, and actively had Michoacan advertised as a tourist destination. The Mexican government developed beach resorts in the 1940s and 1950s in Acapulco, under president Miguel Alemán, who in his post-presidency became Commissioner of Tourism. Other beach resorts on the Pacific coast were also developed, including Mazatlan, Puerto Vallarta and on the Baja California peninsula at Cabo San Lucas. Later on the Yucatan Peninsular the government promoted the development of Cancún. The importance of tourism in Mexico has seen its head having a cabinet-level position. Attracting tourists from the developed world spurred the construction of upscale hotels, particularly by U.S. hotel chains. San Miguel de Allende, Guanajuato developed as an artists' colony. Unlike beach resorts developed by the Mexican government, San Miguel was promoted to tourists by locals. Starting in the late twentieth century, Mexico has been alert to international venues to both protect tourist destinations such as archeological sites, colonial cities, and natural wonders listed as UNESCO World Heritage Sites. With the inauguration of the UNESCO Intangible Cultural Heritage program, Mexico has certified the cultural importance of Days of the Dead (2003), Mexican cuisine (2010), mariachi music (2011), and charrería (2016), among others. Private philanthropy has played an important role in the preservation and restoration of a number of Mexican sites, most prominently by entrepreneur Carlos Slim, whose Foundation for the Historic Center of the City of Mexico (Fundación del Centro Histórico de la Ciudad de México) has made a significant difference in the historic core of the capital, including security concerns. Violence and political turmoil in Mexico has been a problem which affects travel and tourism. The years of the Porfirio Díaz regime (1876-1911) saw a decrease in violence and the rise of tourism. The Mexican Revolution 1910-20 was a major civil war, but following that the Mexican government achieved a level internal security that saw the rise of tourism and cultural exchanges in the 1920s and 1930s. In recent years, with the drug war in Mexico, U.S.