I would like to suggest The Pivot of Civilization by Margaret Sanger since I got some encouraging response from the thread I posted earlier. I just ordered a copy from Borders.com but it's also available for free online at Gutenberg: http://www.gutenberg.org/etext/1689
The book is about Sanger's belief that birth control is a human right and a contributing factor to peace, prosperity, and civilization. Sanger was a nurse in the early 20th century who saw many working class women and children suffering both in America and abroad. Distributing birth control information was considered pornographic and criminal. She was forward-thinking and passionate. The issues she spoke about are still relevant today but she is also controversial for her advocacy of eugenics and attitudes toward immigrants and African Americans.
Here's a quote from the introduction:
"Those critics who condemn Birth Control as a negative, destructive
idea, concerned only with self-gratification, might profitably open
the nearest dictionary for a definition of "control." There they would
discover that the verb "control" means to exercise a directing, guiding,
or restraining influence;--to direct, to regulate, to counteract.
Control is guidance, direction, foresight. It implies intelligence,
forethought and responsibility. They will find in the Standard
Dictionary a quotation from Lecky to the effect that, "The greatest of
all evils in politics is power without control." In what phase of life
is not "power without control" an evil? Birth Control, therefore, means
not merely the limitation of births, but the application of intelligent
guidance over the reproductive power. It means the substitution of
reason and intelligence for the blind play of instinct."
Here's an article on her when she was named one of the Time 100.