BotswanaFirst Americans Arrived 21,000 Years Ago
Ancient DNA evidence suggests the first people in the Americas arrived no earlier than 21,000 years ago, during the coldest part of the last ice age. Researchers evaluated genetic, archaeological, and environmental evidence to narrow down the timeline.
Global Newsflix 2 min read
Researchers led by Bethany Potter at the University of Kansas reviewed published research to reevaluate the three main migration models. These models propose that the ancestors of today's Indigenous Americans arrived before, during, or after the Last Glacial Maximum.
The team examined findings from ancient DNA, archaeological sites, and environmental data to test the three scenarios. They found that the evidence best fits a timeline of 14,000 to 20,000 years ago.
Arriving after 14,000 years ago is at odds with most genetic evidence, which shows that key population lineages split well before a land path through the ice opened up. The authors argue this makes it more likely that people had already entered the Americas by this point.
Proposed dates for the arrival of the first humans in the Americas span more than 100,000 years. Some archaeological sites suggest earlier human activity, but current genomic data show no population splits stretching that far back.
The researchers sorted archaeological hypotheses into three models, according to how each relates to the Last Glacial Maximum. They then asked what genetics would be expected to show for each model.
The authors rank American sites by how much controversy they attract. Among the most disputed are Cerutti, Topper, Chiquihuite cave, and Pedra Furada.
The study's findings provide fresh clues about the history of the Americas, but major questions remain. The arrival of the first humans in the Americas is still a topic of debate among researchers.
Key facts
- The first people in the Americas arrived no earlier than 21,000 years ago.
- The arrival occurred during the coldest part of the last ice age.
- Researchers evaluated genetic, archaeological, and environmental evidence to narrow down the timeline.
- The study's findings provide fresh clues about the history of the Americas.
Three perspectives
Neutral
The study's findings provide a new perspective on the history of the Americas, but the topic remains a subject of debate. Further research is needed to confirm the timeline. The arrival of the first humans in the Americas is a complex topic that requires continued investigation.
Positive
The study's findings are a significant step forward in understanding the history of the Americas. The research provides a new framework for understanding the migration of the first humans to the continent. The findings have the potential to shed new light on the origins of Indigenous American populations.
Negative
The study's findings are limited by the availability of genetic and archaeological evidence. The research raises more questions than it answers, and the topic remains a subject of controversy. The findings may be disputed by other researchers, and further investigation is needed to confirm the timeline.
Your week in news, every Wednesday
The biggest stories of the week for your edition, in your inbox every Wednesday morning, your time. Free, and you can unsubscribe at any time.