Why was Bolivia named as an independent country rather than joining Peru or Argentina in 1825?

In 1825, the region known as Upper Peru (or Charcas) became the independent country of Bolivia primarily due to the influence of local Creole elites. Following the liberation of the territory by forces under Antonio José de Sucre, these elites, who were largely defecting royalists, successfully persuaded Sucre and Simón Bolívar to grant the region autonomy rather than incorporating it into neighboring Peru or Argentina.1

On August 6, 1825, an Upper Peruvian congress formally declared the nation independent. This decision reflected the political desires of the local elite, who sought to maintain their own governance rather than being absorbed by the neighboring revolutionary powers. While guerrilla units had kept the independence movement alive in the region for 16 years, few of these commanders were able to secure a role in the resulting government, which remained dominated by the Creole elite.1