The large ranchers tried to drive out the Selkʼnam, then began a campaign of
extermination against them, with the complicity of the Argentine and Chilean governments. Large companies paid sheep farmers or militia a bounty for each Selkʼnam dead, which was confirmed by the presentation of a pair of hands or ears, or later a complete skull. They were given more for the death of a woman than a man. In addition,
missionaries disrupted their livelihood through forcible relocation, The colonial authorities were aware of the indigenous group's plight, but sided with the ranchers' cause over the Selkʼnam's, who were excluded from their worldview which was based on concepts of "progress" and "civilization." Ranchers typically exercised their own judgement, including the financing of violent campaigns. Considerable numbers of foreign men were hired and quantities of arms were imported for these campaigns to eliminate the Selkʼnam, who were perceived as a major obstacle to the success of colonists' investments. Farm employees later confirmed the routine nature of such campaigns. Little is known of those responsible for these actions; they included many ranch owners, who were the direct superiors of the employees that participated in the ventures. Among those who hunted the indigenous people were
Julius Popper, Ramón Lista, Alexander McLennan, a "Mister Bond", , Samuel Hyslop, John McRae, and Montt E. Wales. Prominent landowners with responsibility included
Mauricio (Moritz) Braun (brother of businesswoman
Sara Braun), who acknowledged having financed some campaigns, justifying them as only intending to protect his investments (he was the employer of another known exterminator, Alexander A. Cameron); and
José Menéndez, the father-in-law of Mauricio Braun, known for acting with the most severity against the Selkʼnam in the Argentine territory of Tierra del Fuego. The owner of two cattle ranches that occupied more than in the center of Selkʼnam territory, Menéndez was the boss of Alexander MacLennan. MacLennan, a Scotsman known as ("The Red Pig"), became notorious for his brutal treatment of indigenous people, participated in the massacre at , where 17 indigenous people died. When he retired after 12 years of service, Menéndez gave MacLennan a valuable gold watch in recognition of his service. The shareholders of the Company for the Exploitation of Tierra de Fuego () strove to hide their actions towards native tribes from the public. This was both a means for the company to avoid questioning and a strategy to lower its controversial profile. Special attention was paid to these events after the intervention of the
Salesian missionaries, who condemned the actions of the ranchers while themselves contributing in more subtle ways to the extermination of native cultures. Beginning in the 1890s, the situation of the Selkʼnam became severe. As the territories of the north began to be largely occupied by farms and ranches, many indigenous people, besieged by hunger and persecuted by European and South American colonists, started to flee towards the extreme south of the island. This region was already inhabited by indigenous groups who had a strong sense of ownership over the land. Consequently, the fights for control of territory intensified. The predicament of the Selkʼnam worsened with the establishment of religious missions, which introduced lethal illnesses to the vulnerable population. As part of the campaign of extermination, the
Fuegian dog was hunted to extinction due to its use in hunting and homemaking among the Selkʼnam. Later conflicts between governor Señoret and the head of the Salesian mission only served to worsen, rather than improve, conditions for the Selkʼnam. Long disputes between civil authorities and priests did not produce a satisfactory solution to the "indigenous issue". Governor Señoret favored the ranchers' cause and took little interest in the incidents that took place in Tierra del Fuego. Two Christian missions were established to preach to the Selkʼnam. They were intended to provide housing and food for the natives, but closed due to the small number of Selkʼnam remaining; they had numbered in the thousands before Western colonization, but by the early twentieth century only a few hundred remained. Repression against the Selkʼnam persisted into the early twentieth century. Chile moved most of the Selkʼnam in their territory to
Dawson Island in the mid-1890s, confining them to a Salesian mission. Argentina finally allowed Salesian missionaries to aid the Selkʼnam and attempt to assimilate them, with their traditional culture and livelihoods then completely interrupted. About 4,000 Selkʼnam were alive in the mid-nineteenth century; by 1930 this had been reduced to about 100. According to the 2010
United Nations Educational, Scientific and Cultural Organization (UNESCO) ''Atlas of the World's Languages in Danger'', the
Selkʼnam language, believed to be part of the
Chonan language family, is extinct, as the last speakers died in the 1980s. == Assimilation and adoption ==