So under this definition none of the groups that the European explorers encountered were Indigenous since they weren't the first ones to live on the land. Only the very first (probably extinct) group that lived on the land 20000 years ago gets that title.

So under this definition none of the groups that the European explorers encountered were Indigenous since they weren't the first ones to live on the land. Only the very first (probably extinct) group that first lived on the land 20000 years ago gets that title.