This is an article on the legal implications, in Brazil, of the traditional occupation of land by the Yanomami indigenous people, having as a starting point the construction of the North Perimetral Highway in 1973, which corresponded to a large influx of non--indigenouspeople and land conflicts. It seeks to demonstrate, analysing the Brazilian Constitutions after 1967, the received legal norms, the international treaties, and the inter-American jurisprudence that the legal order in Brazil provides for the possession of indigenous lands, the usufruct of their natural resources, the demarcation, and removal. Ho-wever, the State systematically violates these rights, eventually causing humanitarian cri-ses. This serious phenomenon occurred twice. In the Dictatorship, specially from 1975 to 1990, and during the Brazilian Democracy crisis, starting in 2014. In both, the bodies of the inter-American human rights system were provoked. Although indigenous rights are well developed in Brazil, their effectiveness is still a challenge, due to the political opposition of certain social groups, which culminates, in periods of greater democratic fragility, in humanitarian crises that are the object of analysis by the Inter-American Commission on Human Rights. Human Rights and by the Inter-American Court of Human Rights, which have jurisdiction over Brazil.