Why do so many US children have PTSD symptoms?

While many people expect post-traumatic stress disorder to be an issue for returning soldiers, it is far more pervasive in US inner cities.

For the BBC's America First? series, Aleem Maqbool is exploring health and social issues where the US, the richest country in the world, does not perform well in international rankings.

Video by Franz Strasser; produced by Ashley Semler and filmed by Ian Druce.