Groups of hunter-gatherers had spread across North America south of the ice sheets as long ago as:
AThree thousand years
BThirteen thousand years
CThirty thousand years
DThree hundred years
Answer & Solution
Correct answer: B. Thirteen thousand years
1. The spread came after the crossing.
2. It is measured in thousands of years.
3. It is thirteen thousand years ago.
_Source: OpenStax World History Volume 1, Chapter 8, The Americas._
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