The phrase most likely refers to the legal framework established by the Law 10 of 1986 in Colombia (often associated with the "Estatuto Nacional de Estupefacientes"), or a specific industrial/architectural movement regarding reinforced materials during that era.
While the term originated in the colonial era, its relevance in 1986 is tied to:
Historically, the classification of a house as being made of materiales fuertes
Analyze whether these "strong" legal measures provided stability or if they were too brittle, leading to further social fracture. 4. The Cultural Dimension