Mexico, country of southern North America and the third largest country in Latin America, after Brazil and Argentina. Mexican society is characterized by extremes of wealth and poverty, with a limited middle class wedged between an elite cadre of landowners and investors on the one hand and masses of rural and urban poor on the other. But in spite of the challenges it faces as a developing country, Mexico is one of the chief economic and political forces in Latin America. It has a dynamic industrial base, vast mineral resources, a wide-ranging service sector, and the world’s largest population of Spanish speakers—about two and a half times that of Spain or Colombia. As its official name suggests, the Estados Unidos Mexicanos (United Mexican States) incorporates 31 socially and physically diverse states and the Federal District.