In the absence of enforcement mechanisms, it is unclear how legislators can cooperate over time to protect the diverse interests of the diverse subnational interest of small provinces. Using Argentina as a case study, this research argues that the economic geography of a country and the need to maintain inter-party cohesion directly influences the ability of legislators to advance diverse subnational interests. Since the mid-1990s, a small group of Argentine legislators has protected sugar producers by forming coalitions to override two presidential vetoes under institutional characteristics unfavorable to inter. temporal cooperation. This research demonstrates that territorial patterns of economic production and the need for political parties to maintain internal cohesion has played a critical role in allowing the formation of the super majorities necessary to protect varied subnational interests across time.