Indigenous cultures of North and South America

When we discuss the early history of the Americas, we need to consider the early indigenous cultures and understand the complex society that was present before Europeans arrived. For this assignment:
Write (2 pages) comparing the indigenous cultures of North and South America. Be sure to address the following questions:
How did the Olmec, Aztec, Inca, Maya, and North American Indians differ in their ways of life and cultural achievements?
How did their circumstances (e.g., geography, history, and/or the accomplishments of the societies that had preceded them) serve to shape their traditions and cultures?
Are these traditions and cultures still alive today?