I. The document discusses the origins and spread of civilizations in ancient Mesoamerica and South America. Early hunter-gatherer societies emerged around 20,000 BCE and began cultivating crops like maize and potatoes by 5000 BCE, leading to more sedentary agricultural villages. The first complex chiefdoms and city-states emerged around 1200 BCE, most notably the Olmec civilization. II. Between 150-900 CE, major civilizations developed across Mesoamerica, including the large city of Teotihuacan in central Mexico and the Classic Maya civilization across southern Mexico and Central America, with dozens of city-states having thousands of inhabitants each. However, these declined between 700-900 CE likely