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In page Usos y costumbres:

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Spanish colonial authorities in the Americas were ordered to investigate the traditions and customs of indigenous communities, and to apply these traditions to disputes among Indian subjects.[1] Scholar José Rabasa traces the term usos y costumbres to the New Laws of 1542, which ordered traditional procedures be used in dealings with Indians rather than "ordinary" Spanish legal proceedings. The division of legal authority is associated with notion of a Republic of Indians (Spanish: República de Indios) subject to distinct legal norms under Spanish colonial rule.[2] According to Rabasa, this division "at once protects Indian communities from Spaniards, criollos, and mestizos, and alienates Indians in a separate republic, in a structure not unlike apartheid."[2]