Probably the best thing one could do for the Incas and Aztecs and other pre-Columbians would be to show them what a wheel is and how it works.
I had also heard that “American Indians” never discovered the “wheel”.
Not sure if that is true?
They had the wheel but without any beasts of burden the wheel was not considered of much use and so was used only in toys and things like that.
I heard once they didn’t invent the wheel because the circle his supposedly a religious symbol for them. I once also heard that they did not invent the wheel because they never had large animals like horses or oxen to pull carts. Not sure what the truth is.
Probably the best thing one could do for the Incas and Aztecs and other pre-Columbians would be to show them what a wheel is and how it works.
As I recall the American Indians did not have the bow and arrow. It was brought by the Europeans. The horse did not exist in the New World until it was introduced by the Spaniards.