This document summarizes two of the earliest civilizations in Central and South America - the Olmec in Mexico and the Norte Chico in Peru. The Olmec civilization flourished between 1400 BCE to 400 BCE, developing advanced mathematics, calendars, writing systems, and constructing pyramids, aqueducts and drainage systems while practicing intensive maize and cacao agriculture. The Norte Chico civilization arose earlier between 3000 BCE to 1800 BCE and centered around religious and trade centers, practicing cotton agriculture and trading it for fish with coastal groups, without developing pottery or writing systems like the Olmec. Both civilizations laid the foundations for later Mesoamerican and Andean cultures.