The Americas were the final continents that humanity discovered, and the early Native American settlers were an extremely tough people, that first had to endure the frozen Arctic. In order to survive, the people who would eventually conquer the Americas developed some peculiar adaptations, and It’s possible that these people were separated from the rest of humanity for 15,000 years. A small group of explorers stood on the brink of a new world. The Americas, a 15 million square mile region to the south, contained vast plains, dense rainforests, and massive mountain ranges.
Credit Ancient Geographic