When the 1921 census' results are compared with the results of Mexico's recent censuses as well as with modern genetic research, there is high consistency with respect to the distribution of Indigenous Mexicans across the country, with states located in south and south-eastern Mexico having both the highest percentages of population who self-identify as Indigenous and the highest percentages of Amerindian genetic ancestry. However, this is not the case when it comes to European Mexicans, as there are instances in which states that have been shown through scientific research to have a considerably high European ancestry are reported to have very small white populations in the 1921 census, with the most extreme case being that of the state of Durango, where the aforementioned census asserts that only 0.01% of the state's population (33 persons) self-identified as "white" while modern scientific research shows that the population of Durango has similar genetic frequencies to those found on European peoples (with the state's Indigenous population showing almost no foreign admixture either). Various authors theorize that the reason for these inconsistencies may lie in the Mestizo identity promoted by the Mexican government, which reportedly led to people who are not biologically Mestizos to identify themselves as such.