Editing Teotihuacan (section)

===Population===
[[File:Teotihuacán_-_Menschenopfer_2.jpg|thumb|right|250px|Human sacrifices found at the foundations of La Ciudadela.]]

Teotihuacan had one of the largest, or perhaps had the largest, population of any city in the [[Basin of Mexico]] during its occupation. Teotihuacan was a large pre-historic city that underwent massive population growth and sustained it over most of the city's occupancy. In 100 CE, the population could be estimated at around 60,000–80,000, after 200 years of the city's occupancy, within {{val|20|u=km2}} of the city. The population, eventually, stabilized around 100,000 people around 300 CE.<ref name="State and Society at Teotihuacan, M">{{cite journal |last1=Cowgill |first1=George |title=State and Society at Teotihuacan, Mexico |journal=Annual Review of Anthropology |date=October 1997 |volume=26 |pages=129–161 |doi=10.1146/annurev.anthro.26.1.129}}</ref>

The population reached its peak numbers around 400 to 500 CE. During 400 to 500 CE, the Xolalpan period, the city's population was estimated to be 100,000 to 200,000 people. This number was achieved by estimating compound sizes to hold approximately 60 to 100, with 2,000 compounds.<ref name="State and Society at Teotihuacan, M"/> These high numbers continued until the city started to decline between 600 and 700 CE.<ref name="Teotihuacan" />

One of Teotihuacan's neighborhoods, Teopancazco, was occupied during most of the time Teotihuacan was as well. It showed that Teotihuacan was a multiethnic city that was broken up into areas of different ethnicities and workers. This neighborhood was important in two ways; the high [[infant mortality]] rate and the role of the different ethnicities. The high infant mortality rate was important within the neighborhood, and the city at large, as there are a large number of perinatal skeletons at Teopancazco. This suggests that the population of Teotihuacan was sustained and grew due to people coming into the city, rather than the population reproducing. The influx of people came from surrounding areas, bringing different ethnicities to the city.<ref>{{Cite journal|last=Manzanilla|first=Linda R.|date=2015-03-16|title=Cooperation and tensions in multiethnic corporate societies using Teotihuacan, Central Mexico, as a case study|journal=Proceedings of the National Academy of Sciences|language=en|volume=112|issue=30|pages=9210–9215|doi=10.1073/pnas.1419881112|pmid=25775567|pmc=4522775|bibcode=2015PNAS..112.9210M|issn=0027-8424|doi-access=free}}</ref>

Teotihuacan also had two other neighborhoods that prominently depicted this multiethnic city picture. Both neighborhoods contained not only different architecture from the other parts of Teotihuacan but also artifacts and burial practices that began the narrative of these places. Archaeologists have also performed oxygen isotope ratio testing and strontium isotope ratio testing to determine, using the bones and the teeth of the skeletons uncovered, whether these skeletons were native to Teotihuacan or were immigrants to the city.<ref name=":13"/><ref name=":22">{{Cite journal |last1=White |first1=Christine D. |last2=Spence |first2=Michael W. |last3=Le Q. Stuart-Williams |first3=Hilary |last4=Schwarcz |first4=Henry P. |date=July 1998 |title=Oxygen Isotopes and the Identification of Geographical Origins: The Valley of Oaxaca versus the Valley of Mexico |url=http://dx.doi.org/10.1006/jasc.1997.0259 |journal=Journal of Archaeological Science |volume=25 |issue=7 |pages=643–655 |doi=10.1006/jasc.1997.0259 |bibcode=1998JArSc..25..643W |issn=0305-4403}}</ref><ref name=":32">{{Cite journal |last1=White |first1=Christine D. |last2=Spence |first2=Michael W. |last3=Longstaffe |first3=Fred J. |last4=Law |first4=Kimberley R. |date=December 2004 |title=Demography and ethnic continuity in the Tlailotlacan enclave of Teotihuacan: the evidence from stable oxygen isotopes |url=http://dx.doi.org/10.1016/j.jaa.2004.08.002 |journal=Journal of Anthropological Archaeology |volume=23 |issue=4 |pages=385–403 |doi=10.1016/j.jaa.2004.08.002 |issn=0278-4165}}</ref> The oxygen ratio testing can be used to determine where someone grew up, and the strontium ratio testing can be used to determine where someone was born and where they were living when they died.<ref name=":13" /><ref name=":22" /><ref name=":32" /> These tests revealed a lot of information, but specifically enabled clear distinction between the people living in the ethnic neighborhoods and those native to Teotihuacan.

One neighborhood was called Tlailotlacan and was believed to be a neighborhood of migrants predominantly from the Oaxaca region.<ref name=":22" /><ref name=":32" /> The excavations there featured prominently artifacts in the Zapotec style of from the Zapotec region, including one tomb with an antechamber.<ref name=":13" /> The oxygen isotope ratio testing was particularly helpful when analyzing this neighborhood because it painted a clear picture of the initial influx from Oaxaca, followed by routine journeys back to the homeland to maintain the culture and heritage of the following generations.<ref name=":22" /><ref name=":32" /> Later oxygen isotope ratio testing also revealed that out of the skeletons tested, four-fifths of them had immigrated to the city or were born in the city, but spent their childhood in their homeland before returning to Teotihuacan.<ref name=":32" /> There was evidence of constant interaction between Teotihuacan and the Oaxacan homeland through journeys taken by children and mothers, keeping the culture and the roots to their homeland alive.<ref name=":32" />

The other main neighborhood was called Barrio de Los Comerciantes, or the Merchants' Barrio.<ref name=":13" /> There is less information about those who lived here (or perhaps more research needs to be done), but this neighborhood also had clear differences from other areas of the city. The architecture was different, featuring round adobe structures, as well as foreign pottery and artifacts identified as belonging to the Gulf Coast region.<ref name=":13" /> This neighborhood, similarly to Tlailotclan, saw a huge influx of immigration, determined by the strontium isotope ratio testing of bones and teeth, with people spending a significant part of their lives before death in Teotihuacan.<ref name=":13" />