Pre-Columbian era

The pre-Columbian era refers to the history of the Americas before significant European influence. This period begins with the initial peopling of the Americas during the Upper Paleolithic. It concludes with the onset of European colonization, marked by Christopher Columbus's voyage in 1492. In Brazil, this time is specifically called the pre-Cabraline era.

During these thousands of years, many Indigenous cultures developed. They built permanent settlements, large cities, and complex societal hierarchies. Some groups created monumental architecture and massive earthworks. While some civilizations declined before European colonies formed, others were still thriving when Europeans arrived.

Scientists study how people first arrived in the Americas using genetics and archaeology. Many researchers believe Asian nomadic Paleo-Indians entered via Beringia, a land bridge now known as the Bering Strait. Some may have also traveled along the Pacific coast. Genetic evidence in mitochondrial DNA, or mtDNA, supports the theory of multiple migrating populations.

Researchers also look at Y-chromosome DNA to track male lineages. One common haplogroup among Indigenous Amerindians is Q1a3a. This genetic marker suggests that some populations in South America have been isolated for at least 18,000 years. The study of these mutations helps trace the two major genetic episodes: the initial peopling and the later European colonization.

There is an ongoing scientific debate regarding the exact chronology of these migrations. The short chronology theory suggests movement into the Americas occurred no earlier than 14,000 to 17,000 years ago. This theory follows successive waves of immigrants. Conversely, the long chronology theory proposes that the first people arrived much earlier, perhaps 30,000 to 40,000 years ago. One well-known early group is the Clovis culture, with sites dating to about 13,000 years ago.

Some artifacts suggest humans reached Cape Horn at the southern tip of South America by 14,000 years ago. This would mean the Inuit arrived much later, perhaps only 2,000 years ago, moving from Siberia into Alaska.

In North America, the Lithic stage was defined by an unstable climate as the ice age receded. During this time, Paleo-Indians lived as mobile hunter-gatherers. They typically moved in small family bands of 20 to 50 members. These groups hunted extinct giant animals, such as mastodon and ancient bison. They used various tools, including distinctive projectile points and knives.

As the climate stabilized about 10,000 years ago, many distinct linguistic and cultural groups emerged. Over millennia, these people domesticated plants that now make up 50% to 60% of all worldwide agriculture. While Arctic and coastal peoples remained hunter-gatherers, agriculture allowed populations to rise in temperate regions.

As societies grew more complex, they began building massive earthworks. In the Lower Mississippi Valley, people were building mounds as early as 5500 BCE. The Watson Brake site features eleven platform mounds constructed starting around 3400 BCE. This discovery changed scientific assumptions about social structures. It showed that complex construction could happen even before societies became fully sedentary or adopted ceramics.

Another major site is Poverty Point, built around 1500 BCE. This complex includes six concentric half-circles and is nearly a mile across. These traditions of mound building continued through the Woodland period, which lasted from 1000 BCE to 1000 CE.

The Mississippian culture represents a peak of social complexity in the Southeast and Midwest. Emerging around 1000 CE, these people grew maize intensively and lived in stratified societies. They built large earthen mounds and grand plazas.

Their largest urban center was Cahokia, located near modern East St. Louis, Illinois. At its height between the 12th and 13th centuries, Cahokia may have had over 20,000 residents. This made it the most populous city in North America at the time. The site of Monks Mound remains the largest prehistoric earthen construction in the Americas. Mississippian trade networks were vast, reaching from the Great Lakes to the Gulf of Mexico.

Understanding this era has required a shift in how historians work. Before the 19th century, scholars mostly relied on accounts from European conquerors and travelers. This often led to biased or inaccurate interpretations. In the 1800s, researchers like John Lloyd Stephens and Alfred Maudslay began criticizing these early sources.

They helped move the field toward modern archaeology. Today, the study of pre-Columbian cultures uses multidisciplinary scientific methods. This includes analyzing surviving written records, such as those from the Maya, and using advanced genetic testing. These tools allow us to reconstruct the true history of the Americas with greater accuracy.