Answer:The rise of the Aztecs
The word Azteca is derived from Aztlán (variously translated as “White Land,” “Land of White Herons,” or “Place of Herons”), where, according to Aztec tradition, their people originated, somewhere in the northwestern region of Mexico. The Aztecs are also known as Mexica or Tenochca. Tenoch, or Tenochca, was a legendary patriarch who gave his name to Tenochtitlán, the city founded by the Aztecs on an island in Lake Texcoco, in the Valley of Mexico. The name Mexica came to be applied not only to the ancient city of Tenochtitlán but also to the modern Mexican country and its inhabitants (Mexico, Mexicans).
The language of the Aztecs was Nahuatl (Nahua), part of the Uto-Aztecan linguistic family that, at the time of the early explorations of America by Europeans, was influencing languages as far north as the Yellowstone River and as far south as Panama. Once the Aztecs achieved political ascendancy, Nahuatl became the lingua franca of an area almost as large as present-day Mexico.
The empire the Aztecs established was equaled in the New World only by that of the Incas of Peru, and the brilliance of their civilization is comparable to that of other great ancient cultures of America and the Old World. From their legendary land of Aztlán, the Aztecs came into contact with the highly developed Toltec civilization of central Mexico and its capital, Tula, a magnificent urban centre with pyramids, temples, public buildings, statuary, private residences, and ball courts. The appearance of the Aztecs is linked, however, not to the splendour of Tula and of the Toltec but to their decline. For reasons not fully known but having to do with internal social, political, and religious conflicts, a tremendous cultural catastrophe occurred at the beginning of the 12th century ad. The city of Tula was attacked and destroyed, as were other important Toltec centres. Tribes of hunters and gatherers took advantage of the situation and added to the chaos, traveling from the arid plateau of northern Mexico toward the fertile, heavily settled central zone. Among them were the Acolhua in the 1100s and, in the 1200s, the Chichimecs, who settled at Tenayuca; the Otomí, who took control of Xaltocan; the Tepanecs, who conquered Atzcapotzalco; and the Aztecs. Except for the Otomí, all were Nahuatl speakers.
According to Aztec legend, from the beginning of the 12th century to the beginning of the 13th, the Aztecs wandered in search of a new place to settle. During that time a group of Chichimec, under the leadership of Xólotl, established a capital in Tenayuca and later in Texcoco. Xólotl’s Chichimec joined forces with the remaining Toltec, who were firmly entrenched in Culhuacán. Apparently, this confederation led to a period of relative peace and cultural progress in the Valley of Mexico. During this time the Aztecs established a precarious home near the ruins of Tula, where they improved their agricultural methods and other technological knowledge. But their stay was temporary. Aztec tradition has it that the god Huitzilopochtli ordered them to leave again in search of a permanent home, which would be indicated by an eagle perched on a nopal cactus with a serpent in its beak.
Their long pilgrimage ended in the year of “two house,” according to their calendar (ad 1325). On a small island in Lake Texcoco, elder members of the tribe spotted the eagle, the cactus, and the serpent. There they built a temple and, around it, the first dwellings of what was to become the powerful city of Tenochtitlán. Five centuries later the capital city’s foundation story would be depicted and memorialized on Mexico’s national flag.
The swamp-surrounded island on which the Aztecs took refuge was so uninviting that none of the powers in the Valley of Mexico had claimed it. Tenochtitlán was thus located at the edge of the lands occupied by the valley’s three powers: the Chichimec of Texcoco, the Toltec of Culhuacán, and the Tepanec of Atzcapotzalco. It was not long before the Aztecs used their strategic position to advantage by aiding the Tepanec in a war of expansion against the Toltec, the Chichimec, and other neighbouring peoples. And by 1428 the Aztecs’ ruler, Itzcoatl (“Obsidian Snake”), and his chief adviser, Tlacaelel, led the Aztecs in conquering their old allies and overlords. Under a succession of ambitious kings in the 15th century, the Aztecs established a dominion that eventually stretched over most of present-day Mexico.