I have a bit of a funny story about that.

I'm in Ontario and we do the stupid land acknowledgments as well. When we do, we specifically name the "Haudenashawnee" as the "traditional" owners.

Problem is, "Haudenashawnee" (ie Iroquois) aren't the traditional owners. All of southern Ontario was occupied by the Huron (Ashinabec) when Europeans arrived. The Iroquois went to war with them over beaver hunting (literally the Beaver Wars; they went as far south as Kansas, iirc) and drove them off the land. The Iroquois then hunted the beaver to near extinction, then left. Then another group, the Mississaugas, just walked in to the vacant space from where they were living (north of Lake Superior).

80 years later, the Americans revolted against the British. The Iroquois fought with the British but lost their land when the treaty was signed, so the British government bought all of southern Ontario from the Mississaugas and gave the Iroquois, under Joseph Brant, a nice chunk of it for them to settle.

So, today, the Ashinabec are fighting against the Haudenashawnee in the schools over who gets to get acknowledged.

In reality, nobody "owned" the land before Europeans arrived because absolutely no one here was advanced enough to have a formal concept of property ownership, much less land ownership.