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Why did the Peru-Bolivia Confederation end after the Battle of Yungay?

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Flag of Peru with three vertical stripes, red on each side and white in the center, and a central coat of arms featuring a vicuña, cinchona tree, and cornucopia.
Peru

The Peruvian–Bolivian Confederation was a short-lived union that faced significant opposition from neighboring South American states, particularly Chile, which feared the power of the new entity.

The Battle of Yungay, fought on January 20, 1839, served as the decisive turning point in this conflict. Chilean forces, supported by Peruvian opponents of the confederation's leader, Andrés Santa Cruz, achieved a total victory over the confederation's army. This military defeat directly caused the immediate dissolution of the union, leading to the exile of Santa Cruz and the end of his protectorate.1