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The Chaco War (, ) was fought from 1932 to 1935. It was between Bolivia and Paraguay over control of the northern part of the Gran Chaco region (known in Spanish as the Chaco Boreal), which was thought to be rich in petroleum. The war is also referred to as La Guerra de la Sed (Spanish for "The War of Thirst"), since it was fought in the semi-arid Chaco. It

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