Humans first evolved in Africa some 4 - 5 million years ago. Over the next 4 million years, through the interplay of evolution and adaptation, survival and extinction, many species of humans evolved. By 100,000 - 120,000 years ago, people physically like modern humans had evolved in Africa and sometime around 100,000 years ago some of them migrated out into the rest of the world, reaching central and eastern Asia by at least 40,000 to 50,000 years ago. And it was from these "out-of-Africa" populations that the first immigrants into the Americans came, reaching North America about 12,000 years ago by means of a "land bridge" between Asia and North America.
Native Americans turned wild plants such as corn, potatoes, pumpkin, yams, and lima beans into farm crops for human consumption. More than half of modern American farm products were grown by Native Americans before British colonization Medicine was not an unknown science in the Western Hemisphere. Most natural herbs used for medicinal purposes in the modern world had also been used by Native Americans before European contact
Native Americans turned wild plants such as corn, potatoes, pumpkin, yams, and lima beans into farm crops for human consumption. More than half of modern American farm products were grown by Native Americans before British colonization Medicine was not an unknown science in the Western Hemisphere. Most natural herbs used for medicinal purposes in the modern world had also been used by Native Americans before European contact