The Lumpkins live at the definition of the back of beyond, in a hollow at the top of a valley at the end of a long and muddy dirt road. It is strewn with litter. Packs of stray dogs prowl around, barking at strangers. There is no telephone and since their pump broke two weeks ago Candy has collected water from nearby springs. Oblivious to it all, her five-year-old daughter Amy runs barefoot on a wooden porch frozen by a midwinter chill.

It is a vision of deep and abiding poverty. Yet the Lumpkins are not alone in their plight. They are just the negative side of the American equation. America does have vast, wealthy suburbs, huge shopping malls and a busy middle class, but it also has vast numbers of poor, struggling to make it in a low-wage economy with minimal government help.

A shocking 37 million Americans live in poverty. That is 12.7 per cent of the population - the highest percentage in the developed world. They are found from the hills of Kentucky to Detroit's streets, from the Deep South of Louisiana to the heartland of Oklahoma. Each year since 2001 their number has grown.