Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatemala, Belize, and the Caribbean Sea; and to the east by the Gulf of Mexico. Mexico covers 1,972,550 square kilometers (761,610 sq mi), making it the world's 13th-largest country by area; with approximately 126,014,024 inhabitants, it is the 10th-most-populous country and has the most Spanish-speakers. Mexico is organized as a federal republic comprising 31 states and Mexico City, its capital. Other major urban areas include Monterrey, Guadalajara, Puebla, Toluca, Tijuana, Ciudad Juárez, and León. Human presence in Pre-Columbian Mexico goes back to 8,000 BCE and it went to become one of the world's six cradles of civilization. In particular, the Mesoamerican region was home to many intertwined civilizations; including the Olmec, Maya, Zapotec, Teotihuacan, and Purepecha. Last were the Aztecs, who dominated the region in the century before European contact. In 1521, the Spanish Empire and its indigenous allies conquered the Aztec Empire from its capital Tenochtitlan (now Mexico City), establishing the colony of New Spain. Over the next three centuries, Spain and the Catholic Church played an important role expanding the territory, enforcing Christianity and spreading the Spanish language throughout. With the discovery of rich deposits of silver in Zacatecas and Guanajuato, New Spain soon became one of the most important mining centers worldwide. Wealth coming from Asia and the New World contributed to Spain's status as a major world power for the next centuries, and brought about a price revolution in Western Europe. The colonial order came to an end in the early nineteenth century with the War of Independence against Spain. (Source: Wikipedia.org, CC BY-SA)