tracing the territorial dynamics of party fragmentation in mexico (1991-2015)

Over the past decades, Mexican politics evolved from a closed, corporative and hegemonic-party authoritarianism, towards a more plural and competitive multi-party system. In the nineties, three relevant parties structured electoral politics. But this system soon fragmented and reached an average of 5.6 effective parties in 2015. What causes and drives political and partisan fragmentation in Mexico? Which have been the main temporal and territorial dynamics? How did they reshape Mexico’s electoral geography?