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I would examine the effect upon the social structure, community cohesiveness and overall happiness that the rapid increase in the square footage per person in houses has had on American culture over the last 50 years ago(267 sq ft/person circa 95 to over 1000 sq ft/person today). I believe that this rapid expansion of the suburbs, and the disappearance of children from neighborhoods compared to the 1950s-70s has had an extremely deleterious effect upon everyones happiness.