They didn't invent it quickly enough i.e. they generally lagged behind Eurasian civilizations by several thousand years so by 1500 they were approximately still stuck in the bronze age or so.
American agriculture was very advanced for the time and the crops and ideas developed transformed food and agriculture throughout the rest of the world. What was lacking were beasts of burden and metallurgy and resistance to smallpox.
American agriculture was very advanced for the time and the crops and ideas developed transformed food and agriculture throughout the rest of the world. What was lacking were beasts of burden and metallurgy and resistance to smallpox.