In 1899, the Bolivians established an administrative post in Puerto Alonso, collecting taxes and levying customs duties on the activities of the Brazilians. The following year, Brazil accepted Bolivia's sovereignty in the area, when it officially recognized the old boundaries at the Beni-Mamoré confluence. The rubber tappers, unaware of the diplomatic proceedings, judged their interests to have been harmed and began rebellious movements, causing two major contestations.
