This site
https://www.atlasobscura.com/places/casa-grande-ruins
"Built by the ancient Sonoran people around 1350, the structure was abandoned only a century afterward, and was already in ruins by the time Kino came upon it."
Padre Kino may not have been the first European to see it but first to note it, I read somewhere. Which may refer to Cabeza de Vaca?
I wonder why pueblos would be built and then abandoned with no apparent cause. Seems this happened a few times.
And wonder if some Indians heard of the Spanish and left. Not meaning Casa Grande, but other groups after the Spanish came.
Bowman is right that people generally were not told the entire truth about history. In America anyway, as children we were not given the entire story.
Once older we are free to hsearch, and form an opinion.
Maybe off topic but do you have an opinion about the places abandoned without apparent cause in the Southwest?