 Said registers also put in question other narratives held by contemporary academics, such as European immigrants who arrived to Mexico being almost exclusively men or that "pure Spanish" people were all part of a small powerful elite as Spaniards were often the most numerous ethnic group in the colonial cities(currently on discussion) as there were menial workers and people in poverty who were of complete Spanish origin.Estimates of Mexico's white population differ greatly in both, methodology and percentages given, extra-official sources such as The World Factbook and Encyclopedia Britannica, which use the 1921 census results as the base of their estimations calculate Mexico's White population as only 9% or between one tenth to one fifth one tenth or one fifth (the results of the 1921 census, however, have been contested by various historians and deemed inaccurate).Surveys that account for phenotypical traits and have performed actual field research suggest rather higher percentages