Which countries fought Paraguay in the War of the Triple Alliance?

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The War of the Triple Alliance (1864/65–1870) was fought between Paraguay and an alliance of three countries:

These nations formed the "Triple Alliance" and declared war on Paraguay on May 1, 1865, following regional disputes and the intervention of Paraguayan forces in the area. The conflict, which remains the bloodiest in Latin American history, resulted in a devastating loss of life for the Paraguayan population and significant territorial losses for the country.12