Prehistoric Texans. Most likely traveled across land bridge from Asia to North AmericaBering Straits. . . . Paleo-Indian Period. Began about 12,000 years agoUsed flint tipped spears to hunt mammoths, mastodons, and giant buffaloTheories about extinction of large animals 1. humans hunted them to extinction2. environmental changes occurred as the ice caps melted3. disease killed them off.
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