Indigenous voters and party system fragmentation in Latin America

This article shows that ethnic cleavages have contributed to electoral fragmentation in Latin America, but not in the way that the social cleavages literature would expect. It finds that party system fragmentation in the region is not correlated with ethnic diversity, but rather with the proportion of the population that is indigenous. The failure of the main parties to adequately represent indigenous people, it argues, has led indigenous voters to shift their support to a variety of smaller populist and leftist parties, which has produced high levels of party system fragmentation in indigenous areas. Where a significant indigenous party has emerged, however, indigenous voters have flocked to that party, which has reduced party system fragmentation. Analyses of sub-national electoral data from Bolivia, Ecuador, Guatemala, and Peru provide support for these arguments.