Republic of South Peru Peru and North Peru reverted to being a single Republic of Peru. The Peru-Bolivian Confederation was a plan that attempted to reunite the "Alto Perú" ("Upper Peru", now Bolivia) and "Bajo Perú" ("Lower Peru", now simply Peru) into a single political and economic entity. Marshal Andrés de Santa Cruz promoted an ambitious project to reunite these two territories on the basis of a confederacy. This integration was based not only on historical, cultural and ethnic reasons, but also on sound economic motives. The union was trying to restore the ancient commercial routes and promote a policy of open markets. As
Third Upper Peru campaign would spread rumors in Europe that the May Revolution was over. Third Upper Peru campaign Third Alto Perú campaign (1815): The Northern Army, unofficially commanded by José Rondeau, started another campaign, but this time without the authorization of Supreme Director Álvarez Thomas. With the lack of official support, the army faced anarchy and later would lose the aid of the Provincial Army of Salta, commanded by Martín Miguel de Güemes. After being defeated in the battles of Venta y Media (October 21) and Sipe-Sipe (November 28), the northern territories were lost. They were reannexed by the Spanish Viceroyalty of Peru,