The Seneca Falls Convention met for the purpose of pursuing women's rights. Women in the United States at that time had very few rights. One right they did not have was the right to vote. The Declaration called for that right, among others.
The issue of women's rights was coming to the fore at this time because of changes that were sweeping America. There were many efforts to improve social conditions of all sorts. One of these was the abolitionist movement. Many women were involved in that movement. Their involvement in fighting for others' rights led them to want to fight for their own rights. This is why they met in Seneca Falls and it is why they wrote the Seneca Falls Declaration.
With the emergence of the Age of Reform in American History, there was considerable action taken towards voicing the conditions of those who had been silenced throughout the narrative of the young nation. The rise of the Abolition of slavery had also spawned the belief that there was a need to redress the condition of women in America. The Seneca Falls Declaration was conceived to bring to light specific resolutions that would be presented to the convention being held at Seneca Falls. These resolutions would serve as the benchmark of the convention dedicated to the advancement of Women's Rights in America. This convention and its corresponding declaration sought to address the role of women from a political, economic, and social points of view. It sought to bring to light a new conception of how women would be seen and how they would see themselves. Similar to Jefferson's document, it sought to make a formal break with what is in its articulation of what can and should be.