They did build permanent, dwellings, towns and even cities. Where have you gotten this notion that they didn’t? Do you thing they all lived in teepees?
http://nas.ucdavis.edu/Forbes/The%20Urban%20Tradition%20Among%20Native%20Americans.pdf
From the above link:
“In fact, it may well be that the Americas witnessed a greater process of urban development in pre-1500 CE times than did any other continent, with the growth of the most elaborate planned cities found anywhere. In fact, the evidence seems to indicate that from about 1600–1700 BC. until the 1519–1520 CE”
http://www.legendsofamerica.com/il-cahokia.html
http://www.theancientweb.com/explore/content.aspx?content_id=19
http://www.wsu.edu/~dee/CIVAMRCA/CIV.HTM
http://heritage-key.com/site/caral
http://en.wikipedia.org/wiki/San_Lorenzo_Tenochtitlán
http://www.legendsofamerica.com/nm-acoma.html
I can’t have an ungoogle theory on why they didn’t build cities, because they indeed did build cities in the Americas.
See above, that’s just the cities, mostly I’m going to work on the towns and permanent dwelling now. Off to see the Pueblos…..
This isn’t a tremendously well thought out answer for right now but the question is just wrong, sweetie, my Dutchess dearest.