Raquel Rolnik, the UN special rapporteur for the right to adequate housing, who has just completed a seven-city tour of America, said it was shameful that a country as wealthy as the US was not spending more money on lifting its citizens out of homelessness and substandard, overcrowded housing.

"The housing crisis is invisible for many in the US," she said. "I learned through this visit that real affordable housing and poverty is something that hasn't been dealt with as an issue. Even if we talk about the financial crisis and government stepping in in order to promote economic recovery, there is no such help for the homeless." Read more.