Claims that the New Orleans floods have laid bare a growing racial and economic divide in the US have, until now, been rejected by the American political establishment as emotional rhetoric. But yesterday's UN report provides statistical proof that for many - well beyond those affected by the aftermath of Hurricane Katrina - the great American Dream is an ongoing nightmare.
The document constitutes a stinging attack on US policies at home and abroad in a fightback against moves by Washington to undermine next week's UN 60th anniversary conference which will be the biggest gathering of world leaders in history.
The annual Human Development Report normally concerns itself with the Third World, but the 2005 edition scrutinises inequalities in health provision inside the US as part of a survey of how inequality worldwide is retarding the eradication of poverty.
... "There is an urgent need to develop a collective security framework that goes beyond military responses to terrorism," it continues. " Poverty and social breakdown are core components of the global security threat."
The document, which was written by Kevin Watkins, the former head of research at Oxfam, will be seen as round two in the battle between the UN and the US, which regards the world body as an unnecessary constraint on its strategic interests and actions.