All the big cities in the USA have huge homeless populations. And most are undercounted, as they may or may not include the people who live in their cars. 5000 of those in Seattle, at least. The problem is serious everywhere, because of the incredible income divide, and the very high prices of real estate. In Miami, for example, about 10,000 children in the school system are homeless. This is a similar percentage in most big US cities. The homeless in the USA certainly include drug addicts, the mentally ill, and alcoholics, but also many many children, mothers, and working families. Really, when argentines complain about Buenos Aires, I just have to laugh. There is no comparison.