COCHABAMBA, Bolivia — In the days since the ouster of Evo Morales, Bolivia’s first Indigenous president, deep ethnic tensions that have long divided the country have erupted, complicating efforts to move Bolivia out of political crisis.

Mr. Morales, a champion of the Indigenous, has now been replaced by an acting president of European descent, and resentments have surfaced. Police officers have ripped the Indigenous insignia off their uniforms. Protesters have burned the Indigenous flag. And the acting president, who posted tweets many consider racist, initially appointed a cabinet without a single Indigenous member.

“We feel threatened,” said Juan Acume, a farmer from the Quechua, an Indigenous group, near a protest barricade of earth mounds and tree trunks across Bolivia’s main highway on Wednesday night. “They don’t represent us; they reject us, the Indigenous.”