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Starting in 1886, Europeans arrived in pursuit of rubber, using the native peoples to do the work in exchange for axes, machetes, beads, tin cans, mirrors, and such. The Bora were eager to obtain these things, but after a time rebelled at being enslaved by outsiders. This led to warfare and the massacre of thousands of indigenous people. Those who remained were whipped or beaten until dead, or until they were willing to penetrate the rain forest to collect rubber.