I did not mean to address the temporary presence of Aztecs in SW USA. My point was I do not believe there was a common ancestor in modern times between Toltecs; Olmecs, and the Aztecs.
I do not doubt the POSSIBILITY of a temporary presence of Aztecs in the SW. It is not known where the Aztecs came from. Ideas range from Utah, to the Lost Tribes of Israel. I doubt the latter, y-marker DNA would show that in a heart beat, though I still feel eventually DNA is going to give the answer.
Utah, based on some archaeological studies is a POSSIBILITY but I also do not believe the Aztecs knew where they came from, no scholars here in Mexico, and some have access to some really old documents, have said the Aztecs knew. If they came from Utah, they may well have passed through the SW, though how long they stopped would be hard to know.
They wandered around, and some books on the Aztecs tell us when they finally found the eagle and the snake, it was on the lake which is where the center of Mexico City is today. And, they were a rag tag group of people scurrying away from
unfortunately unsuccessful attempts to kill them. No one especially liked a group of insane people who ripped the hearts out of living human beings and it makes sense they wandered far and for a long time.
They went to a small island in the middle of the lake, and as long as they stayed there, they were left alone. They started dredging to expand the island, which eventually became very large. Today, you have to travel some distance to find the remnants of that lake. In fact, not desiring much to do tourist things, I have never been to Xochimilco but my family has several times.
Samuel Eliot Morrison, in his Oxford history of the American people, Volume 1, page 37, reported that a female human remains found in Lake Pelican, Minn, had a conch shell from the Gulf of Mexico. It is believed to be perhaps as much as 11,000 years old. So, my view is traders did indeed go long distances in ancient times. Thus, I have no doubt Aztec traders, or independents hoping to take some of their money, went as far north as the SW US. And, it is possible they talked about Moctezuma. I would be surprised at anything else.
I wonder if everyone knows Moctezuma was a family name, not a personal name, it's just that this Emperor was known by his family name. Which in fact was not Moctezuma, that is the modern spelling. I am not sure I have it right, but it was something like Mocteuctzoma. The local church records used several spellings in the 1600's, but that one was one of them. Mocteozoma was another. And, Moteuhoma, sigh. By the 1800's, they used Moctesuma.
The point is, if they use the name Moctezuma in the SW USA, it was not used in his day. But, traders would almost certainly have reported who was in charge down here. Montezuma was the Americanized version.
Moctezuma II was Emperor #9, reigned 1502-1520. His uncle Ahuizotl was #8, and his father #6. Wikipedia says the 5th Emperor, reigned 1440-1469, was his great-grandfather and is now known as Moctezuma I. Here is a family tree of all Emperors:
http://en.wikipedia.org/wiki/Aztec_emperors_family_tree It looks like #7 was also an uncle.
http://www.foxnews.com/story/0,2933,292069,00.html tells of the possible discovery of the tomb of Ahuizotl in Mexico City.
Now, my local ruins. It is believed they were built by another Indian nation, which was after 1500, conquered by the Aztecs. At that time, the Moctezuma family had members living here, and they were at times caciques. So, if the Moctezuma wanted a place to bury the Emperor, they certainly controlled the land and could put him wherever they wished.