There is now no doubt that cultural contacts took place between the peoples of Asia and America during the Middle or Late Paleolithic Age. In the course of one particular period, betweeen 20,000 and 40,000 years ago, there came from Asia, in successive waves, the first groups who were to populate the American continent.
What still remains a mystery—the “enigma of the Indian race,” is the origin of a second generation of “homo americanus,” the founder of the high cultures. From the lest millennium B.C. onwards, some Central American tribes evolved with unexpected speed towards a superior level of culture, creating class distinctions, a priest-hood, religious creeds, an artisan class producing artistic works of great value, and a body of knowledge almost scientific in character. This development sprang from a basic culture which was possibly even inferior to that enjoyed by peoples in other parts of the world. This prompts several questions.