One of the main rhetorical devices present in this piece are metaphors. One example of the usage of metaphors would be when Sitting Bull exclaims, "the love of possessions is a disease in them." By this, he means that the white men have becoming overbearingly greedy. So much so that there greed for land and material possessions has consumed there lives and their moral values.
Another very prominent rhetorical device found in this speech is personification. He uses personification in all three paragraphs,