I recently met a man who was a Navajo from Northern Arizona.  He asked me about the native peoples from where I live (Southern Ontario).  He also mentioned that Navajo speakers from the US Southwest have a very similar language to the native people of Northwestern Canada, and this surprised me.

I later did some reading and it seems that the Athabaskan people of what is now Canada did indeed migrate South to that area and essentially displaced the local Pueblo tribes around AD1400 (and before the Spanish arrived to the area).

I wonder how the Pueblos felt about having their agricultural culture attacked by these nomadic hunters at the time?