What, exactly, is the premise? It sounds kind of like the book The Handmaids Tale. In this book there is some sort of apocolypse which is caused by Christian Fundamentalists who take over the American Gov't and, by rule, the USA. Most of the women become sterile (presumably from chemicals and environmental polutants, although I don't think that this is confirmed). Those women who are still able to bear children become property of the rich and powerful. They are kept as slaves to procreate with the men and bear their children who are raised by their wives.

Is this similar to Children of Men?