What is the fine-grained topic of the following text: Native Land: Nomads of the Dawn author Jamake Highwater uses a tapestry of ritual dance, drama and storytelling to trace the path of the nomads who discovered the Americas and created the complex civilizations of the Aztecs, Incas and other South American tribes. Only return the topic.
Jamake Highwater's approach to tracing the civilizations of South American tribes in his book Native Land: Nomads of the Dawn.