I showed you a Spanish Mission south ofTubac, AZ that was in ruins. This one (the oldest European structure in Arizona) is north. As you can see, unlike Tumacacori, San Xavier remains in perfect condition, even repaired after extensive damage in an 1887 earthquake.
The Mission which was in northern Mexico when it was built by the Jesuit Priests, and later taken over by the Franciscans, is part of Southern Arizona in the U.S. It actually sits on the reservation of the Tohono O'odham Indians.