Americans raised in poor families do markedly less well compared to those from middle class or affluent homes—and it doesn’t matter whether you choose college attendance, employment rates, or future household income as your measure. And the longer they live in poverty the worse the odds that they’ll escape it in adulthood; for one thing, they’re far less likely to finish high school or attend college than their more fortunate peers. [...] Yet childhood circumstances can be (and have been) changed—and the sorts of government programs that conservatives love to savage have helped enormously in that process.