The old men want war, but the younger ones are holding them back. That generation divide was clear among the Uru-Eu-Wau-Wau tribe, who live deep in the Brazilian Amazon.

Endangered by land grabbers and illegal loggers, the tribe called a meeting to discuss how to fight back and plan for the year ahead, Brazil’s second under Jair Bolsonaro’s presidency.

“You say we cannot kill, but the white man does not respect us,” said Uaka, one of the village elders, standing up to speak in broken Portuguese...