sentences:  Additionally 10,000 Native Americans were taken prisoner of whom 3,000 ended up in Buenos Aires separated by sexes to avoid their procreation.The boundary treaty of 1881 between Chile and Argentina bought most of the desert under definitive Argentine sovereignty; previously Chile had claimed varying now Argentine areas under claims of inherited colonial titles.In the few decades before and after 1900 the less dry parts of the Patagonian steppe experienced a sheep farming boom, transforming the region into one of the world's greatest exporters of ovine products.