The document provides background information on early civilizations in Mesoamerica, including the Olmec, Maya, and Aztec civilizations. It notes that the Olmec may have been the first civilization in the Americas and were mound builders, while the Maya had a sophisticated culture with accurate calendars, writing, mathematics, astronomy, and engineering. It also discusses the Mississippian culture in present-day Alabama that practiced farming and was influenced by technologies from Mesoamerica.