The Trap of Time
Gladwin has a better answer, which is also an attack on a basic weakness of his opponents. Through many years he has been pointing out that friends of the inventive Indian have been getting squeezed tighter and tighter in a trap of their own independent invention. It is the trap of time.
When the Spaniards found the New World, they found it full of inventions and discoveries. There were cities of stone, painted temples, great pyramids. Metal workers smelted ores, made alloys, and cast elaborate ornaments of gold by a most intricate process. There was a complex despotism in Mexico and as complex and despotic a communism in Peru. The Maya had a calendar more accurate than the one Columbus used. They had devised a hieroglyphic writing and knew how to make cement. The Indians of both continents had developed an extensive agriculture, with potatoes and fertilizers in Peru and corn and beans and tomatoes all over the place.
As soon as the archaeologists decided that all this had been invented in the New World with no help to speak of from the Old, they had to recognize that it would take quite a little time. At first this posed a difficulty, for there was no very early evidence of man in Mexico. In 1917, however, came the discovery of skeletons and pottery under a lava flow at Copilco near Mexico City and of a primitive pyramid half buried under the same flow at near-by Cuicuilco; and the archaeologists promptly dated the eruption of the lava at 4000 B.C.
Then, unfortunately, new evidence narrowed the trap of time once more. George C. Vaillant and his wife dated other sites with the same kind of pottery as Copilco considerably later than the birth of Christ. A radiocarbon date based upon charcoal within the pottery level below the Cuicuilco lava falls between these guesses; it is 2422 ± 250 years.[15] The Basket Makers advanced from an estimated 2000 B.C. to a tree-ring date about A.D. 217. And all this time nobody could find any really primitive beginnings of pottery in Middle America, and nothing that seemed earlier than the birth of Christ. The trap of time was growing tighter and tighter. A very elaborate civilization would have to develop in 1,500 years, without any roots. Gladwin pointed out this difficulty and urged the theory that man came into the Americas not only as a paleolithic primitive 15,000 or 25,000 years ago, but as a fairly civilized and perfected neolithic close to the beginning of the Christian era.