Moctezuma I
Reign

As tlatoani, Moctezuma solidified the alliance with two neighboring states, Tlacopan (a small city-state) and Texcoco. Tlacopan, located on the western shore of Lake Texcoco, controlled seven city-states to the northwest, while Texcoco was located on the eastern shore and rule over nine city-states in the northeast. As the two regions were added to Moctezuma's empire, the Aztecs relied on already established city-states to increase military power. In this skillfully crafted Triple Alliance, 2/5ths of the spoils would go to Tenochtitlan and another 2/5ths to Texcoco, with the remaining 1/5 given to Tlacopan.

Among the Aztecs' greatest achievements, Moctezuma and Nezahualcoyotl of Texcoco organized the construction and completion of a double aqueduct pipe system, supplying the city of Tenochtitlan with fresh water. This provided an ample supply of fresh water to Texcoco's various communities, which extended over a distance of 12 kilometres (7.5 mi) from their lakeshore to the hills of Tetxcotxinco.

Early in his rule, he conquered the state of Oaxaca in 1445. Moctezuma then went on to extend the boundaries of the Aztec empire beyond the Valley of México to the Gulf Coast, known as the "Sea of the Sky", for the first time, subjugating the Huastec people and Totonac peoples and thereby gaining access to exotic goods such as cocoa, rubber, cotton, fruits, feathers, and seashells. The Aztec were then known as the "Neighbors of the Sea of the Sky", as they controlled all the territory up to the Gulf of Mexico.
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