Why Commemorate the 1850 Woman's Rights Convention?

"The movement in England, as in America, may be dated from the first National Convention, held at Worcester, Mass., October, 1850." The speaker was Elizabeth Cady Stanton; the occasion, the opening session of the 1870 Woman's Rights Convention in New York City called to commemorate the twentieth anniversary of the beginning of the woman's rights movement.

Why did Stanton, Susan B. Anthony, Lucretia Mott and other pioneers who signed the "Call" to the 1870 meeting regard the 1850 Convention as the beginning of the crusade for woman's equality? Why not the 1848 meeting at Seneca Falls for which Stanton drafted the celebrated Declaration of Sentiments and in which Mott played a leading role? Their reasons were several: