The women's rights movement in the United States originated mainly with the movement for the abolition of slavery. The abolitionist movement was one of the first big reform movements in the United States. Many women were attracted to the movement, including women such as Elizabeth Cady Stanton who would later become very important in the women's rights movement. While fighting to end slavery, some of these women came to regard their own legal position as little better than that of the slaves. Because of this, they were inspired to start a movement of their own.
Sorry- It is not really clear to me whether shani28 is asking exclusively about the American women's rights movement or generally about the early beginnnings in England or Europe or elsewhere?