when did the aztecs arrived at lake texcoco
Lake Texcoco Tenochtitlan was founded on an islet in the western part of the lake in the year 1325. Around it, the Aztecs created a large artificial island using a system similar to the creation of chinampas. To overcome the problems of drinking water, the Aztecs built a system of dams to separate the salty waters of the lake from the rain water of the effluents.[3] It also permitted them to control the level of the lake. The city also had an inner system of channels that helped to control the water.
Paris Peace Accords
Aztec Empire The Aztec Empire, or the Triple Alliance (Classical Nahuatl: Ēxcān Tlahtōlōyān, [ˈjéːʃkaːn̥ t͡ɬaʔtoːˈlóːjaːn̥]), began as an alliance of three Nahua altepetl city-states: Mexico-Tenochtitlan, Texcoco, and Tlacopan. These three city-states ruled the area in and around the Valley of Mexico from 1428 until the combined forces of the Spanish conquistadores and their native allies under Hernán Cortés defeated them in 1521.
Xochimilco The canals of Lake Xochimilco were initially created along with artificial agricultural plots called chinampas. Chinampas were invented by the pre-Hispanic peoples of the region around 1,000 year ago as a way to increase agricultural production. On the shallow waters of the lakes, rafts were constructed of juniper branches. Onto these rafts floating on the water, lakebed mud and soil were heaped and crops planted. These rafts, tied to juniper trees, would eventually sink and a new one be built to replace it. Over time, these sunken rafts would form square or rectangular islands, held in place in part by the juniper trees. As these chinampa islands propagated, areas of the lake were reduced to canals. These “floating gardens” were an important part of the economy of the Aztec Empire by the time the Spanish arrived.[33][34][35] Today, only about 5,000 chinampas, all affixed to the lake bottom, still exist in their original form, surrounded by canals and used for agriculture. The rest have become solid ground and urbanized. In the center of Xochimilco, there are about 200 chinampas, covering an area of 1,800 hectares. However, one reason the number has decreased is that smaller chinampas have been combined to create larger ones.[31] While there are still those who maintain chinampas traditionally, and use them for agriculture, the chinampa culture is fading in the borough with many being urbanized, and being turned into soccer fields, and sites for housing and businesses.[28] The deterioration of many of these chinampas can be seen as their edges erode into the dark, polluted water of the canals.[34] The most deteriorated chinampas are located in the communities of Santa María Nativitas, Santa Cruz Acalpixca, San Gregoria Atlapulco and Ejido de Xochimilco. Together, these have a total of thirty eight illegal settlements. To repair a number of chinampas, the borough along with federal authorities, has reinforced forty two km of shoreline, of the 360 km (220 mi) that exist in the lake area. This involves the planting of juniper trees and the sinking of tezontle pylons into the lakebed.[28] These remaining chinampas are part of the Xochimilco World Heritage Site.[34] Have since changed use and become residences and businesses. Those that remain agricultural are mostly used as nurseries, growing ornamental plants such as bougainvilleas, cactuses, dahlias, day lilies, and even bonsai.[36] As they can produce up to eight times the amount of conventional land,[11] they are still an important part of the borough’s agricultural production.[34] There have been various attempts to save the remaining chinampas, including their cataloguing by UNESCO, UAM and INAH in 2005, and various reforestation efforts, especially of juniper trees.[22][31]