Read the excerpt from Midsummer by Derek Walcott. The leaf stems tug at their chains, the branches bending like Boer cattle under Tory whips that drag every wagon nearer to apartheid. This excerpt makes an allusion to the Second Boer War, which was fought among the United Kingdom, the South African Republic, and the Orange Free State between 1899 and 1902. Which statement best describes the effect of the allusion?