[allmost]

Wheelbarrow? Any slightly mechanized machine for textiles, wind mills, archimedean water pumps, etc. No draft animals involved. If they had the wheel, IMO, the initial contact would have been reversed.

[Harmless Teddy Bear]

All of those things come long after you have wheeled carts pulled by draft animals. At least a couple of millenniums later.

No, the only thing that would have given the Native American population a fighting change would have been if they had domecicatable animals. With the lack of them on the American continents the population did not develop the same type of immunities to animal communicated diseases that were common in Europe, Asia and Africa.

It is almost impossible to resist an invader with 90% of your people dead.