Paleo-Indians

Paleo-Indians were the first groups of people to inhabit the Americas. They arrived toward the end of the Late Pleistocene period. The term comes from the prefix "paleo," which means old. It refers specifically to the lithic period in the Western Hemisphere. This is a time defined by stone tool technology. This period is distinct from the Paleolithic era found in the Eastern Hemisphere. Scientists use the term to describe specific cultures and economic livelihoods.

Researchers study how these early people migrated across the world. One traditional theory involves a land bridge called Beringia. This bridge connected North Asia to present-day Alaska. It existed from 45,000 to 12,000 BCE. Small groups of hunter-gatherers likely followed large animal herds into Alaska. As the climate changed, ice-free corridors opened along the Pacific coast. These corridors allowed humans and animals to move south into the continent's interior. Some groups may have traveled on foot. Others might have used boats along the coastline.

Scientists use many methods to track these ancient movements. Molecular data like DNA provides important clues. This genetic evidence links Indigenous Americans to populations in eastern Siberia. There is evidence suggesting at least two separate migrations occurred. The exact timing of these arrivals is still a subject of debate. Some estimates suggest humans reached North America between 15,000 and 20,000 years ago. Other evidence suggests humans reached South America as early as 25,000 years ago.

Life for Paleo-Indians was highly mobile. They lived in small bands of approximately 20 to 60 members. These bands were often made of extended family groups. They moved frequently to find new resources. Some family groups moved every three to six days. They might travel up to a certain distance every year. Their diets were often rich in protein. They used animal hides for both clothing and shelter. During the summer, they gathered nuts, berries, and roots. In the winter, some groups moved inland to hunt and trap animals for furs.

Many Paleo-Indian groups were specialized hunters of megafauna. Megafauna are very large animals that lived during the Pleistocene. These included the woolly mammoth and the American mastodon. They also hunted the giant beaver and the steppe wisent. Other animals included the giant muskox and ancient reindeer. Most of these large animals became extinct near the end of this period. This happened during the Late Pleistocene megafauna extinctions. There is much controversy regarding whether human hunting helped cause these extinctions.

Stone tools are the primary evidence of these early people. Archaeologists classify these cultures by their lithic flaked tools. A notable group is the Clovis culture, which appeared around 11,500 BCE. They used highly efficient fluted-style spear points. A flute is a long groove chipped into the stone. These points were tied to spears made of wood or bone. They also used microblades for butchering and processing hides.

These tools were often traded over long distances. For example, stone tools have been found far from their original sources. This shows connections between different regions like Montana and California.

As the climate stabilized between 8000 and 7000 BCE, life changed. The end of the ice age caused many environmental shifts. Large animals like camels and horses eventually died off in North America. This forced humans to find new ways to survive. Some groups, like the Folsom tradition, began focusing on bison. These people traveled in small groups but returned to specific springs annually. This transition led to a more sedentary lifestyle. This change eventually marked the beginning of the Archaic Period.