In the US, there´s a huge gap between the middle class and the lower class. It´s not uncommon for a family provider to work at two or three places to make ends meet, and I´ve seen a documentary about several families living in the same flat, because the minimum salaries are so low.
I´m sure there are much better sources of information, but Wikipedia tells a little:
http://en.wikipedia.org/wiki/Poverty_in_the_United_States
...and a newspaper article:
http://www.usatoday.com/news/nation/story/2012-02-23/extreme-poverty-increase/53227386/1
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