-Figure 12.12,"Cohabitation in the United States" shows a sharp increase in cohabitation since 1970. Why is the year 1970 significant as the base year used in this chart? Assuming there has always been some degree of cohabitation prior to 1970,what changes in cultural values must have accompanied the increase?

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-Figure 12.12,"Cohabitation in the United States" shows a sharp increase in cohabitation since 1970. Why is the year 1970 significant as the base year used in this chart? Assuming there has always been some degree of cohabitation prior to 1970,what changes in cultural values must have accompanied the increase?