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In page Adolfo Alsina:
"At the end of 1875, the Native Americans of Patagonia and the Pampas, especially the Mapuche, launched organised resistance against the territorial expansion of the southern border of the emerging nation. The first stage of the "Conquest of the Desert" began with the creation of a two meter deep, three meter wide trench called zanja de Alsina to prevent the free movement of horses and stolen cattle. Alsina also ordered the creation of forts intercommunicated by telegraph.
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