When I introduce Native Americans, I say that their history begins with at least one group (and probably at least three), crossing from Asia to North America at least twelve thousand years ago. There is a reason I say "at least"! That is particularly important for the date. Some archaeologists (people who study ancient peoples and places) and many Native Americans believe the first groups arrived much earlier.
A dig in northern Texas turned up some stone tools that appear to be much older than 12,000 years old. The tools are also simpler than the ones found at Clovis, New Mexico, that gave their name to the "Clovis culture", long assumed to be among the first Native Americans.
Maybe soon the date for the arrival of the first people in the Americas will be re-set to an earlier time?
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