America : Looking at the Land of Opportunity again

I am reading the article "Isabel Sawhill and Ron Haskins -- Five myths about our land of opportunity in the washingtonpost.com". The article mentions both positive things and also concerning things like
- "rags to riches in a generation is rare"
- Almost 30 percent of children now live in single-parent families
- Among women under age 30, more than half of all births now occur outside marriage
It is a must read article

in reference to:

"Among women under age 30, more than half of all births now occur outside marriage"
- Isabel Sawhill and Ron Haskins -- Five myths about our land of opportunity - washingtonpost.com (view on Google Sidewiki)