emerging suggests that the Americas were recently colonized by a small number of individuals (effective size of about 70–250), and then they grew by a factor of 10 over 800–1,000 years. The data also show that there have been genetic exchanges between Asia, the Arctic and Greenland since the initial peopling of the Americas. A new study in early 2018 suggests that the effective population size of the original founding population of Native Americans was about 250 people. Depopulation which resulted from disease Early explanations for the population decline of the Indigenous peoples of the Americas include the brutal practices of the Spanish conquistadores, as recorded by the Spaniards themselves, such as the encomienda system, which was ostensibly set up to protect people from warring tribes as well as to teach them the Spanish language and the Catholic religion, but in practice was tantamount to serfdom and slavery. The most notable account was that of the Dominican friar Bartolomé de las Casas, whose writings vividly depict Spanish atrocities committed in particular against the Taínos. The second European explanation was a perceived divine approval, in which God removed the natives as part of His "divine plan" to make way for a new Christian civilization. Many Native Americans viewed their troubles in a religious framework within their own belief systems. According to later academics such as Noble David Cook, a community of scholars began "quietly accumulating piece by piece data on early epidemics in the Americas and their relation to the subjugation of native peoples." Scholars like Cook believe that widespread epidemic disease, to which the natives had no prior exposure or resistance, was the primary cause of the massive population decline of the Native Americans. One of the most devastating diseases was smallpox, but other deadly diseases included typhus, measles, influenza, bubonic plague, cholera, malaria, tuberculosis, mumps, yellow fever and pertussis, which were chronic in Eurasia. However, recently scholars have studied the link between physical colonial violence such as warfare, displacement, and enslavement, and the proliferation of disease among Native populations. For example, according to Coquille scholar Dina Gilio-Whitaker, "In recent decades, however, researchers challenge the idea that disease is solely responsible for the rapid Indigenous population decline. The research identifies other aspects of European contact that had profoundly negative impacts on Native peoples' ability to survive foreign invasion: war, massacres, enslavement, overwork, deportation, the loss of will to live or