The most accurate response regarding the growth of the Mexica kingdom at Tenochtitlan is:
Their god Huitzilopochtli told them where to begin developing their new city on a spot he provided them.
The Mexica, also known as the Aztecs, believed they received guidance from their deity Huitzilopochtli, which led them to settle in Tenochtitlan where they would eventually build a powerful empire.