Paraguay. Brazil On January 9, 1872, Paraguay and Brazil was signed a treaty in which Paraguay recognized, as debt to Brazil, all damages caused to Brazilian people and cities at an interest of 6% with an annual amortization of 1%. Paraguay opened up all of its waterways, the Parana and Uruguay rivers, to Brazilian trade and navigation. Brazil also reserved the right to occupy Paraguay with its imperial army to maintain peace and ensure treaty compliance. The borders between Paraguay and Brazil were established in three different treaties. In the treaty signed on January 9, 1872, the limits were set to be the riverbed of the Paraná River from Yguasu's mouth up to Parana's Seven Falls waterfall or Guaira Falls; from the Guaira Falls, by the summit of the Mbaracayu Range and later by Amambay's up to Apa River's source, from where it follows its riverbed down to its mouth on the eastern shore of the Paraguay River. On January 16, 1872, another treaty was signed for the release of all deserters, prisoners, and war criminals. Two days later a new treaty of Friendship, Commerce and Navigation was signed. By the January 7, 1874, protocol, the Estrella stream was considered the Apa River's source. The last and definite treaty was signed on May 21, 1927, in Rio de Janeiro. A complement to the first treaty, it established that the limit between both countries was the riverbed of the Paraguay river from the mouth of the Apa River with the Paraguay River up to its mouth in Bahia Negra. Uruguay The Treaty of Peace, Commerce and Navigation was signed on December 13, 1873, between Paraguay and Uruguay. As with the Brazilian treaty, Paraguay recognized the expenses, damages, and detriments of the Uruguayan campaign. Both governments also committed to return all prisoners of war and to reopen commerce on the rivers. Argentina A treaty was signed on February 3, 1876, between Paraguay and Argentina. In it, Paraguay recognized all war expenses, damages, and detriments caused to Argentine public and private property, though they were never paid (see above). The Paraguay, Paraná, and Uruguay rivers were also reopened to navigation and transit. The Argentine-Paraguay territorial disputes in the Chaco were resolved as follows. The portion south of the main Pilcomayo riverbed was assigned to Argentina. The portion north of the Verde River (23° 10' Latitude South) was assigned to Paraguay. The central portion