As an English word, pow-wow has also never been about magic - it’s about having a gathering or meeting, generally between different tribes, or at least distant groups. There might be storytelling or dancing, but it’s not magic. (At the annual Stanford University pow-wow, there’s lots of dancing, from lots of different tribes. And lots of eating.)
There are some Native American tribes that do things that might count as “magic” rather than just religion - shamanic ceremonies for healing or insight, or the parts of peyote rituals that weren’t made up by Carlos Castenada, for instance - but they’re generally things you’d do within your own group, not at a pow-wow.