<Tr> <Th_colspan="2"> Envoy </Th> </Tr> <Tr> <Th> Ambassador Gerónimo Gutiérrez </Th> <Td> Ambassador Roberta S. Jacobson </Td> </Tr> <P> Mexico--United States relations refers to the foreign relations between the United Mexican States (Estados Unidos Mexicanos) and the United States of America . The two countries share a maritime and land border in North America . Several treaties have been concluded between the two nations bilaterally, such as the Gadsden Purchase, and multilaterally, such as the North American Free Trade Agreement . Both are members of various international organizations, including the Organization of American States and the United Nations . </P> <P> Since the late nineteenth century during the regime of President Porfirio Díaz (1876--1911), the two countries have had close diplomatic and economic ties . During Díaz's long presidency, Mexico was opened to foreign investment and U.S. entrepreneurs invested in ranching and agricultural enterprises and mining . The U.S. played an important role in the course of the Mexican Revolution (1910--20) with direct actions of the U.S. government in supporting or repudiating support of revolutionary factions . </P>

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