They increased in strength and pop.; They united with two other city-states, Texcoco and Tlacopan to form a Triple Alliance; They gained control over neighboring regions; soon controlled 80,000 sq. mi.; based their power off of military tribute and what they gained out of it; They had loose control over the Empire; They demanded tribute in the form of gold, maize, cacao beans, corn, cotton, jade, etc. They destroyed rebellious villages