The Word for World is Forest
This is a short story focused around colonialism and exploitation, and seems to have originated from Le Guin's exasperation about the morality of exploitation in the U.S's foreign politics, such as the Vietnam war and atomic weapon testing. It takes place in her universe of the Hainish Cycle, and tells a story of humans trying to colonize a planet with other pre-existing native humanoids. It is definitely worth a read at its measly 100 pages.
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