Historically, population studies and censuses have never been up to the standards that a population as diverse and numerous such as Mexico's require: the first racial census was made in 1793, being also Mexico's (then known as New Spain) first ever nationwide population census. Since only part of its original datasets survive, most of what is known of it comes from essays made by researchers who back in the day used the census' findings as reference for their own works. More than a century would pass until the Mexican government conducted a new racial census in 1921 (some sources assert that the census of 1895 included a comprehensive racial classification; however, according to the historic archives of Mexico's National Institute of Statistics, that was not the case). While the 1921 census was the last time the Mexican government conducted a census that included a comprehensive racial classification, in recent years it has conducted nationwide surveys to quantify most of the ethnic groups who inhabit the country as well as the social dynamics and inequalities between them.