An article in Science remakes the timeline of Native American communities acquiring the Horse. The scientific consensus had long been that Native American communities did not get horse in any meaningful way until after the 1680 Pueblo Revolt. That date was dramatically at odds with traditions of Native American communities.
The study detailed in Science radiocarbon dated horse remains from across North America and has brought scientific consensus into closer alignment with Native American understanding. Read the article in Science (here) for details.