Which Archaic Indian culture experienced the highest concentration of people living within one region? Great Basin
Eastern Woodlands
California
Great Plains

The Great Basin

Explanation:

Archaic culture, any of the ancient cultures of North or South America that developed from Paleo-Indian traditions and led to the adoption of agriculture. Archaic cultures are defined by a group of common characteristics rather than a particular time period or location; in Mesoamerica, Archaic cultures existed from approximately 8,000–2,000 BC, while some Archaic cultures in the Great Basin of the U.S. Southwest began at about the same time but persisted well into the 19th century

fairly positive it is 4