Mexico Southward from its 1,500 mile long border with the United States lies the Estados Unidos Mexicanos. A country with slightly more than 750,000 square miles in area, Mexico has a vast array of mineral resources, limited agricultural land, and a rapidly growing population. These factors are the basis for many of the country's present problems as well as opportunities for future development. The nation is struggling to modernize its economy. With more than 80 million people in the mid-1980s, Mexico's overall population density exceeds 110 per square mile. More than half of its inhabitants live in the country's central core, while the arid north and the tropical south are sparsely