In every culture, cultural constructs will be found. What are the cultural constructs found in the U.S., and how are they used to define gender in society? Compare gender constructs in Pastoralist societies. What differences do you find between the United States and a Pastoralist society? The issue of race not being something innate to nature but created by people and hence varying in expression from society to society. As a (friendly) neighbor, i have observed Americans to often believe that if you are "one drop" African or native/Indian then you are no longer white. While this view is less common today, people continue to believe that if you are one-quarter of "African descent", for example, then you are "African American". If races were a fact of biology, which they are not, then person three-quarters "white" should not be "African". It is culture that drives people to make selective decisions about what biological "facts" are used to make the assignment "African", "white" etc.
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http://en.wikipedia.org/wiki/Social_construction_of_gender_difference
http://ilri.org/infoserv/Webpub/fulldocs/Workp27/Gender.htm