The settlement of Argentine Patagonia after the genocidal military campaign of 1878–1885 occurred through discursive, legal, and institutional innovations. This article focuses on the emergence and consolidating of formal property by analyzing how access mechanisms are institutionalized through the constitution of law and public authority. Contests around access to land and resources became embedded in institutional structures in a context of legacies that continue to shape land distribution and dispossession. We argue that propertization, this transition from access to property, with its racial grammar, relies on invisibilization of people, reclassification of land, and the threat of violence.