From the face of it, Puerto Rico and Montana seem to have very little in common. One is a former Spanish colony in the Caribbean whose legal system is mostly based on the civil law tradition. The other is one of the largest, yet most underpopulated, states of the United States, located on the Canadian border. Yet, as with many things related to law and history, appearances can be deceiving.
Jorge M. Farinacci Fernós, Curious In-Laws: the Legal Connections Between Montana and Puerto Rico, 79 Mont. Law. Rev. 187 (2018). Available at: https://scholarship.law.umt.edu/mlr/vol79/iss2/2.