A major tool used by the PRI to maintain its decades-long hold on power was

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Patron-client relationships were a key aspect of the PRI's political strategy. The party relied on a system in which political leaders at the local level would provide services and resources to their constituents in exchange for their loyalty and support in elections. This created a strong network of support for the PRI that was difficult for opposition parties to break into. The system was often criticized for promoting corruption and cronyism, but it helped the PRI to maintain its hold on power for many decades.

A Major Tool Used by the PRI to Maintain Its