uuhhmmm.... i thought firearms were invented in china [gunpowder was introduced by the mongols to europe]- although the europeans took over at some stage in terms of perfectioning them.... . and iron was first smelted in mesopotamia; the first people who understood the iron production from ores [there earlier samples of meteoric iron being used] were the hittites [o.k. they were indoeuropean people ....]
Uuhhmmm, I thought the question was about items being introduced to the Americas!
But if you want to go down the rabbit hole then the Indian people are a relatively late addition to the continent and carried some things there from other places as well as discovering some things in place. There is evidence that they killed off/displaced the earlier first people to discover the continent who seem to of negroid extraction. They were either wiped out or pushed down to Tierra del Fuego.
But I'll not get picky. Sorry just having fun.
Sent via smoke-signal from a woodland in Scotland.