Mining was revitalized and foreign trade increased.
Dynamic growth brought relative prosperity to many economic sectors of various regions of the country, complemented by increased levels of employment.
The Sierra Madre, an extension of the Rocky Mountain chain, divides into the Oriental range to the east and the Occidental range to the west.
Over time, these early peoples built highly organized civilizations, such as the Olmec, Teotihuacan, Mayan, Toltec, Zapotec, Mixtec, and Aztec societies, the majority of which were accomplished in art, architecture, mathematics, astronomy, and agriculture.
In 1517 Spanish explorer Francisco Fernández de Córdoba discovered the Yucatán, a peninsula located in the southeast of Mexico.
Six years later, in order to finish construction of a transcontinental railway, the United States purchased an additional 30,000 square miles of Mexican land for $10 million.
This acquisition was made final through the Gadsden Treaty of 1854 (Carlos Cortés, Harvard Encyclopedia of American Ethnic Groups, p. Approximately 80,000 Mexicans resided in the territory transferred to the United States at the conclusion of the Mexican-American War, the greatest numbers of whom were located in present-day New Mexico and California.
Expanding industrialization has provided additional jobs for greater numbers of workers and increased oil production has brought in needed foreign currencies.