In 1837 the country aggressively challenged the dominance of Peru's port of Callao for preeminence in the Pacific trade routes, defeating the short-lived alliance between Peru and Bolivia, the Peru-Bolivian Confederation (1836–39) in the War of the Confederation.
I 1837 gik landet aggressivt ind i en udfordring af den peruvianske havneby Callaos dominans på stillehavshandelsruterne og besejrede den kortlivede alliance mellem Bolivia og Peru (Peru-Bolivia-konføderationen, 1836-39) i Konføderationskrigen.