| Resumo: | Since the last presidential elections, a dual narrative of politics has prevailed among Mexican elites, breaking with the consensual rhetoric inherited from the post-revolutionary Old Regime. However, the narrative of a Nation divided into two opposing poles conceals a growing plurality, resulting from the long-standing decomposition of the political system. The 2018 electoral tsunami was the product of the erosion of traditional identities, the fragmentation, and the collapse of the party system that channeled politics for three decades. The analysis of the elections held since then allows us to assess its effects: What has changed and what remains of the transitional three-party system? How have the socioterritorial bases of the parties been transformed, and how has Morena grown since 2015? To what extent has the affective and ideological polarization that confronts the elites permeated the electorate? How polarized, or how fragmented, is the vote in geographical and sociodemographic terms? This article addresses these questions with a spatial and cartographic approach, using synthetic maps that capture the geographic reconfiguration of the Mexican party system at the scale of the 300 federal legislative districts.
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