A tariff dispute over wheat and sugar triggered a war that reshaped South America.
In 1836, the formation of the Peru–Bolivian Confederation alarmed Chile and Argentina, sparking a complex regional conflict. Driven by fears of shifting power balances and commercial rivalry, the war ultimately led to the dissolution of the Confederation and the consolidation of national identities in Chile and Peru.
The conflict originated from deep-seated geopolitical anxieties and economic friction. Marshal Andrés de Santa Cruz established the Peru–Bolivian Confederation in 1836, a move that Chile viewed as a direct threat to its regional influence and independence. Tensions escalated over a tariff war; when Peru raised taxes on Chilean wheat by 2,400%, Chile retaliated with equal tariffs on Peruvian sugar. While Argentina also declared war in 1837, its involvement was largely motivated by internal political cohesion and the desire to counter Santa Cruz's support for Argentine opposition figures.
The war was marked by significant internal instability and shifting alliances. In Chile, the conflict was initially unpopular, leading to the assassination of influential statesman Diego Portales in 1837. However, this event transformed public sentiment, turning the war into a national cause. Meanwhile, the military campaign faced early setbacks, including the humiliating Treaty of Paucarpata in 1837, which forced a temporary withdrawal of Chilean forces. The tide turned decisively in 1839 at the Battle of Yungay, where General Manuel Bulnes crushed Santa Cruz's army, leading to the leader's exile and the collapse of the Confederation.
The long-term consequences of the war were profound for the participating nations. The conflict facilitated the expansion of the Chilean state, as the army tripled in size and the bureaucracy grew, ushering in a period of greater political stability. For Peru, the war resulted in the restoration of its pre-Confederation status. Although the primary conflict ended in 1839, regional tensions persisted, culminating in a separate 1841–1842 war between Peru and Bolivia. Ultimately, historians view the War of the Confederation as a pivotal moment that helped solidify the national identities of both Chile and Peru.
Source: War of the Confederation
