What were the groups of mesoamerican people who banded together in 1428?

In 1428, the groups of Mesoamerican people that banded together were the Mexica (Aztecs), the Texcoco, and the Tlacopan. This alliance, known as the Triple Alliance, was formed to strengthen their power against common enemies, particularly the Tepanecs. Together, they expanded their influence and established the foundation for the Aztec Empire, which became one of the most significant civilizations in Mesoamerica.