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Little known facts

Nope.

1,000 DNA samples could not "confirm" that.

Next, researchers estimated when this lineage split from the major known lineage that leads to all other present-day Indigenous people who have been studied genetically across North and South America. They found that this split occurred roughly 18,000 years ago. That newly detected lineage “was very surprising,” says study co-author Ripan Malhi, a geneticist at UIUC. The Blackfoot genomes “didn’t seem to statistically fall within the same lineages that you had previously seen in the Americas.”
 

Next, researchers estimated when this lineage split from the major known lineage that leads to all other present-day Indigenous people who have been studied genetically across North and South America. They found that this split occurred roughly 18,000 years ago. That newly detected lineage “was very surprising,” says study co-author Ripan Malhi, a geneticist at UIUC. The Blackfoot genomes “didn’t seem to statistically fall within the same lineages that you had previously seen in the Americas.”

This research is fascinating. Scientists can make estimates like this because they know the general rate at which mutations in DNA occurs. They can look at how DNA samples match up, and also, by looking at the number of mutations, get an approximate date as to when different groups split off from their common ancestors.

The weak point in the meme above is the statement that "their ancestors lived in Montana for 18,000 years." The DNA evidence can tell WHEN the ancestors of the Blackfeet separated from the larger ancestral group of people living in the Americas, but it doesn't tell you WHERE these ancestors lived. I would think to establish that, you would have to find the remains of people in Montana-- a very rare occurrence in itself-- that from carbon dating can be shown to be about 18,000 years old. Then, they would have to have recoverable DNA-- extremely rare-- and compare it to the contemporary DNA samples they already have.
 
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