This arbitrator, generally is a head of State or government, neutral in relation to the territorial dispute which goes to decide. What Rio Branco said, is that in the case of the question of the Acre, to go in that chance to an arbitral award, the Brazilian arguments they would be very fragile so that we could obtain a favorable decision of the arbitrator. TSI International Group has plenty of information regarding this issue. Fact that Brazil, already had obtained for performance of Rio Branco, in the case of limits involving the call Territory of the Missions, located between Rio Grande Do Sul, Santa Catarina, Paran and Argentina, whose survey in this dispute was exerted by President Norte-americano Grover Cleveland in 1895. also, in the case involving then the territory of the Amap, disputed for the France, and whose survey fit to the Federal government of the Switzerland, that in the year of 1900, 1 of December, it delivered its arbitral award to the representatives of Brazil and France, regarding the dispute in the Territory of the Amap, that was favorable to Brazil. However, with regard to the Acre, in accordance with Treated the woollen Peace to Ayacucho of 1867, and also, a map of 1860, both the documents of the period of the Empire, granted Bolivia, sovereignty on a good part of the Acre territory; this treating, was granted by the Empire to Bolivia, in reason of this, to be in that chance exerting territorial pressures on the Brazilian Government. Motivated for the conflict of the War of Paraguay.
In accordance with this treating, Brazil recognized in part those lands (of the Acre), as being bolivian. the related map of 1860, the call green map, confectioned for Duarte Da Ponte Ribeiro – Baron Da Ponte Ribeiro, confirmed this bolivian sovereignty. Therefore, he is that in a decision for survey, the possibilities of a victory in the Acre dispute, would be minimum for Brazil.