Homelessness has always been present in America: you've probably seen it in movies and TV, from jovial Charlie Chaplin comedies, to traumatised Forrest Gump. But how did we go from the aimless vagabond to nationwide crisis? Why did Americans suddenly start to care after Vietnam? And is there anyway to tackle homelessness? We're chatting all this and more with the Manhattan Institute's Stephen Eide.

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