Sentence:  He draws eclectically on studies of baboons, descriptive anthropological accounts of hunter-gatherer societies and, in a few cases, the fossil record. With this biological framework in place, Corning endeavors to <WSD>show</WSD> that the capitalist system as currently practiced in the United States and elsewhere is manifestly unfair. 
Meaning of the word marked with <WSD> tags:  To indicate (a fact) to be true; to demonstrate.