Overspending on 'luxury' consumer goods, Apple is now a billion Dollar company, some people prefer Nikes instead
Low wage mass immigration
Decay of family structure and parental support nets (40% of children live with single mothers)
Open border free trade that moved the industrial base to Mexico (NAFTA) and China
High taxes, in particular in some states like California
Rising costs for Obamacare / Affordable Car Act for the middle class
Rising rents due to mass immigration (rising demand) in metropolitan areas
Rising cost of colleges due to unlimited government loan hand outs