A referendum to approve the autonomy statute of Santa Cruz Department of Bolivia was held on 4 May 2008. The vote resulted from strains between the Prefecture of Santa Cruz and President Evo Morales. The referendum was declared illegal and unconstitutional by the National Electoral Court. Final results from the referendum showed that 85.6% of participating voters supported autonomy. Abstention rates were 37.9%. Partisans of the Movement for Socialism called for a boycott of the vote, and the Guarayo, Guaraní, Chiquitano, Ayoreo, Yuracaré-Moxeño indigenous peoples rejected holding the vote in their territories.