A shekara ta 1899, mazauna Brazil daga Acre sun kirkiro wata ƙasa mai zaman kanta a yankin da ake kira Jamhuriyar Acre. Bolivians sun yi ƙoƙari su mallaki yankin, amma 'yan Brazil sun tayar da hankali kuma akwai rikice-rikice na kan iyaka, suna haifar da labarin da aka sani da Acre War. A ranar 17 ga Nuwamba, 1903, tare da sanya hannu da sayarwa a cikin Yarjejeniyar Petrópolis, Brazil ta sami mallaka na ƙarshe na yankin. Daga nan aka haɗa Acre a cikin Brazil a matsayin yanki da aka raba zuwa sassan uku. Yankin ya shiga ƙarƙashin ikon mallakar Brazil a musayar biyan fam miliyan biyu, ƙasar da aka karɓa daga Mato Grosso kuma daidai da gina layin dogo na Madeira-Mamoré. Tambaya: A wace shekara aka sanya hannu kan Yarjejeniyar Petrópolis?
Shekara ta 1903