(That's America's; not, of course, America's.)
Jeffrey Sachs of Columbia University has a hard-hitting article under that title at the Guardian that's well worth a read. He paints a picture of a United States "in a nasty mood", no longer interested in compassion, and falling into the politics of racial and religious division. America, he says, "presents the paradox of a rich country falling apart because of the collapse of its core values." It is in the throes, he says, of an "ugly moral crisis".