Ahh I misread it!
Thanks for the correction
I find the old copper culture fascinating.
They were so close to a true metal age, but they never quite got to being able to melt metal and cast it.
The Aztecs and Mayas were right on the edge. They were doing some copper and gold casting. Some of their copper casts seem to have been on the edge of bronze.
The Conquistadors had steel armor, guns, horses, plank built boats, sails, history, and superior religion. They offered the tribes who had been subjugated and terrorized by the Aztecs a better deal. The germs coming from the Old world proved deadlier, faster, than the germs moving from the New World to the Old (syphilis is the most obvious example). Christianity became more popular then human sacrifice and cannibalism.