Your implication that the largest city of Europe at the time of the Cortez conquest being no more than 30,000 population is frankly bizarre.
London was over 40,000 at the time, still recovering from the plague of the previous generation.
Paris had twice that population, Genoa and Venice may have had as much as three times that population. Some estimates of Moscow put it at nearly a quarter of a million around 1500 A.D.
Sounds good. I'm sure I was wrong. What I meant in my fast-type was that none of the Spanish Conquistadors had likely seen anything larger than Madrid, 30,000 plus to my recollection, when they walked into Teotihuacan, 100,000 plus and the center of an amazing city-state that paralleled the Roman achievments. Thanks for the clarification.