Where Did Horses Originate, and How Did They Return to America?
Horses are native to North America. The earliest horse ancestors evolved here more than 50 million years ago, spread into Eurasia across the Bering land bridge, disappeared from North America around 10,000 years ago, and were reintroduced by Spanish explorers beginning in 1493. Timeline: horses in North America Time Period What Happened ~55 million years …