1 in 5 US children live below poverty line, 1/2 of those in extreme poverty
"The truth is that more than one in five U.S. children live below the poverty line, which puts the United States at the bottom of the pack among wealthy nations. Close to one half of those children live in extreme poverty - with parental incomes of less than half the poverty rate" (page 15).
Jeff Madrick, "The Anti-economist: Problem Number One," Harper's Magazine, 327, no. 1961 (2013), 15.