What key factor helped the Aztecs become a stronger empire?

A key factor that helped the Aztecs become a stronger empire was their advanced agricultural techniques, particularly the use of chinampas, or floating gardens. This innovative farming method allowed them to maximize crop yields and support a growing population. Additionally, their strategic military conquests enabled them to expand their territory and control vital trade routes, further enhancing their economic power and political influence. Together, these elements contributed significantly to the Aztecs' strength and stability as an empire.