In the War of the Pacific (1879 - 1883), Bolivia lost its access to the Pacific Ocean after being defeated by which South American country?

Bolivia lost its access to the Pacific Ocean after being defeated by Chile in the War of the Pacific from 1879-1883. The war was mainly triggered by territorial disputes over the mineral-rich provinces of Antofagasta and Atacama, which Bolivia had claimed as its own. Following a series of battles, Chile emerged victorious and Bolivia signed the Treaty of Peace and Friendship in 1904, officially acknowledging its loss of coastal territory to Chile. This overwhelming defeat greatly impacted Bolivia's economy and international trade, as it became a landlocked nation without a direct outlet to the sea.