pendants. 5000 BC–200 AD: The Cochise tradition arises in the American Southwest. 4500 BC: Emergence of the Shield Archaic tradition. Native Americans in the northern Great Lakes produce copper tools, ornaments, and utensils traded throughout the Great Plains and Ohio Valley. Shell ornaments and copper items at Indian Knoll in Kentucky evidence an extensive trade system over several millennia. 4000 BC: Inhabitants of Mesoamerica cultivate maize (corn) while Peruvian natives cultivate beans and squash. 4000–1000 BC: Old Copper complex emerges in the Great Lakes region 3500 BC: The largest, oldest drive site at Head-Smashed-In Buffalo Jump, Alberta, Canada. 3500–3000 BC: Construction of extensive mound complex built at Watson Brake in the floodplain of the Ouachita River near Monroe in northern Louisiana. Shell ornaments and copper items at Indian Knoll, Kentucky evidence an extensive trade system over several millennia. Late Archaic 3000 BC: Cultivation of the sunflower and marsh elder begins in the American South; northeastern natives cultivate amaranth and marsh elder. After harvesting these plants, the people grind their seeds into flour. 3000 BC: The Cochise tradition of the American Southwest begin cultivating a primitive form of maize imported from Mesoamerica; common beans and squash follow later. 3000 BC: Native Americans of the Pacific Northwest begin to exploit shellfish resources. 3000 BC: Fishing in the Northwestern Plateau increases. 3000 BC: Natives speaking the Algonquian languages arrive in the Northeastern Woodlands from the south. Shell ornaments and copper items at Indian Knoll, Kentucky evidence an extensive trade system over several millennia. 2888 BC: People of the Stallings culture on the Savannah River begin making pottery, at a time that pottery making was spreading in South America, but had not reached Mesoamerica. 2500–800 BC: The Arctic Small Tool tradition develops on the Alaska Peninsula, near Bristol Bay, and on the eastern shores of the Bering Strait in Alaska. 2500–1800 BC: Aleutian tradition emerges in Alaska. 2500 BC: Independence I people enter Greenland from North America. The last archaeological evidence of Independence I is from 1730 BC. 2400 BC: Saqqaq people enter Greenland from Siberia and live there until 400 BC. 2500 BC: The Cochise tradition become skilled farmers of the American Southwest. 2100 BC: Maize cultivation begins in Aridoamerica. 2000–1000 BC: Poverty Point culture in northeastern Louisiana features stone work, flintknapping, earthenware, and effigy, conical, and platform mounds, as well as planned settlements on concentric earthen ridges 1500 BC: Salishan speakers arrive