Final answer:
The Tlaxcalan tribes made alliances with Cortés because they did not pay tribute to the Aztecs, joining forces with the Spanish in the siege of Tenochtitlán.
Step-by-step explanation:
The other Native American tribes that made alliances with Cortés were the Tlaxcalan. They did not pay tribute to the Aztecs and joined forces with the Spanish in the siege of Tenochtitlán. The Tlaxcalan provided as many as 200,000 fighters to help the Spanish. This alliance played a significant role in the fall of the Aztec Empire.