In June 1982 an attempt to amend the US constitution to guarantee equal rights for men and women was defeated. Despite two decades of women's liberation activism and a huge groundswell of political support, the amendment was prevented from going through. The defeat was in large part down to one woman, staunch Republican and leading conservative, Phyllis Schlafly. Claire Bowes has been listening to archive recordings of Mrs Schlafly, held by the Abraham Lincoln Presidential library.

PHOTO: American political activist Phyllis Schlafly smiles from behind a pair of podium mounted microphones, 1982. (Photo by Hulton Archive/Getty Images)