Aztecs were known for agriculture , introducing new irrigation system , making artificial islands, making complex calendar system.
Step-by-step explanation:
The Aztecs were the Mesoamerican people resided in Central Mexico during 14th, 15th and 16th century. This Mexican civilization was well known for their culture and mythology. The Aztec empire was annexed in the the year 1521 by Spanish. Large number people died due to smallpox and hunger .
Spanish conqueror Hernan Cortes invaded the Aztecs empire and treated very badly with the native people. For annexing the empire the Spanish used superiors weapons and the the smallpox outbreak together helped the Spanish to annex the empire.