It was fought in an inland southern region of the country, rich in wood and yerba mate, that was called Contestado because it was contested by the states of Paraná and Santa Catarina as well as Argentina. The war had its casus belli in the social conflicts in the region, the result of local disobediences, particularly regarding the regularization of land ownership on the part of the caboclos. The conflict was permeated by religious fanaticism expressed by the messianism and faith of the rebellious cablocos that they were engaged in a religious war; at the same time, it reflected the dissatisfaction of the population with its material situation.