Most Argentines are descended from colonial-era settlers and of the 19th- and 20th-century immigrants from Europe. An estimated 8% of the population is Mestizo, and a further 4% of Argentines are of Arab (in Argentina the Arab ethnicity is considered among the White people, just like in the US Census) or Asian heritage. In the last national census, based on self-identification, 600,000 Argentines (2% of the population) declared to be Amerindians Although various genetic tests show that in average, Argentines have 20 to 30% indigenous ancestry, which leads many who are culturally European, to identify as white, even though they are genetically mestizo. Most of the 6 million European And Arab immigrants arriving between 1850 and 1950, regardless of origin, settled in several regions of the country. Due to this large-scale European and Arab immigration, Argentina's population more than doubled, although half ended up returning to Europe, The Middle East or ended up settling in the United States or Canada.