2008 Bolivian autonomy referendums
Referendums on departmental autonomy statutes were held in four departments of Bolivia—Beni, Pando, Santa Cruz, and Tarija—in May and June 2008. These four departments, known as the Media Luna, voted in favor of autonomy in the June 2006 elections.
Source: Wikipedia — 2008 Bolivian autonomy referendums (CC BY-SA 4.0)