The Aztec empire develops outwardly through Tenochtitlán. In 1400 CE several small empires of the Valley of Mexico started to clash. The Dominant amongst these were Texcoco, capital of the Acholhua region, and Azcapotzalco, capital of the Tepenec. These two empires came face to face in 1428 CE with the Tepanec War. The Azcapotzalco forces were defeated by an alliance of Texcoco, Tenochtitlan. Following victory a Triple Alliance was formed between Texcoco, Tenochtitlán and a rebel Tepanec city, Tlacopan. territorial expansion through the triple alliance attained spoils of war. These rewards typically tributes were shared, still Over time Tenochtitlán came to dominate the Alliance, its Itzocal ruler became the supreme ruler, made reforms to create
