Amie Jane Leavitt 
How STEM Built the Aztec Empire [PDF ebook] 

Mostly known today for its complex pantheon and religious rituals, the Aztec empire was also highly advanced in the fields of science, technology, engineering, and math or STEM. With the capital city of the empire built in the middle of a lake, the geographical, political, and economic needs of the Aztecs drove innovation for centuries. Massive construction projects, including ziggurats, causeways, and aqueducts demonstrated that the Aztecs had ambitious goals as well as the STEM knowledge to achieve them. Though much of its history was destroyed, the accomplishments of the Aztecs are an impressive reminder of history’s ingenuity.