[SpookyZalost]

I think the big things would have been:
1. Advance warning that, despite initially being friendly, the 'white man' was there to take all of their land and eliminate the Natives over time.
2. With this advance warning comes more medical knowledge, and gradual exposure and buildup of immunity to European diseases. Who knows, maybe one developed on their own that the Europeans weren't exposed to.
3. Additional help with technology and resources, i.e. horses, the wheel, metalworking, and gunpowder.

Then it could be a fair fight.

I guess it comes down to how early then... and there are a lot of native tribes to reach out to.

I'd have to get there maybe 30 or 40 years early, have an easy way to travel, a way to communicate with the various tribes... maybe unite them some how like the EU?

because the east coast and gulf of mexico bordering tribes are the ones with the earliest contact in north america...

now if I wanted to go all non interference I could just sink all ships sailing to the americas or some how turn them around but even then...

yeah figuring out a way to give the natives enough time to prepare and the knowledge to do so would be an incredible challenge.

do you know the legend of kokopeli.

it's a mythological figure that shows up among tons of cultures in the area about a traveler who taught the locals stuff and told stories.