For example, full-blooded siblings can often be classified as belonging to different races (Harris 1964).
For these reasons the distinction between "white" and "mixed", and between "mixed" and "black" and "indigenous", is largely subjective and situational, meaning that any attempt to classify by discrete racial categories is fraught with problems.
From the late 19th century to the early 20th century, the number of European immigrants who arrived far surpassed the number of original colonists.
Between 18, of a total 15 million immigrants who arrived in Latin America, The following table shows estimates (in thousands) of white, black/mulatto, Amerindian, and mestizo populations of Latin America, from the 17th to the 20th centuries.
Because of this, Europeans often were the most numerous ethnic group within colonial cities in northern and western Mexico (albeit this trend is also seen in large central Mexican cities such as Mexico City) and became the regions with the highest proportion of whites during the Spanish colonial period.