Carrie Chapman Catt, head of the National American Woman Suffrage Association (NAWSA), and Alice Paul, president of the National Woman’s Party (NWP), were once allies. Over time, however ...

Left, a photograph of Helen Hamilton Gardener circa 1920. Right, an image of the Smithsonian's NAWSA exhibition, featuring the table upon which the "Declaration of Sentiments" was written.

This march occurred before the rift between the more moderate NAWSA and the less conciliatory National Woman's Party. VCG Wilson / Corbis via Getty Images When the 19th Amendment became law in ...