Some parts of the US have pretty high price per square foot and pretty low median incomes within that neighborhood though, so looking at things nationally hides a lot of the nuance that is important to understand the whole. Overcrowding is common among low income people in the U.S. as it is anywhere else in the world. I can take you to parts of CA that will make you think I'm referring to central america and not california with that abbreviation, and these aren't far from cushy white collar jobs and expensive white collar owned homes, sometimes within a couple miles or so. OTOH in areas where housing is considered cheap the poor often aren't faring much better, since social safety nets are either worse or nonexistant and wages (and sometimes even available unskilled labor) amounts to little after the mandatory costs paid in these areas (perhaps car dependency due to a lack of reliable transit to commute to work).