American oaks share a common northern ancestor.
If you had been in northern Canada 45 million years ago, you might have encountered the distant ancestor of all of the oaks in the Americas. That single species gave rise to 220 more and two distinct lineages -- red oaks and white oaks -- that moved south through the boreal zone to populate large swaths of the continent all the way into Mexico.
https://twin-cities.umn.edu/news-events/american-oaks-share-common-northern-ancestor
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