In what way did the quakers of the 1600's and 1700's promote equality?

Unlike other religious groups of the time, Quakers believed in equality and tolerance. They extended that belief to American Indians. Settlers treated American Indians unfairly and pushed them farther and farther west to make room for the growing number of white settlers. As pacifists, Quakers did not believe in conflict. They attempted to treat American Indians fairly. For example, Penn purchased land from the American Indians as opposed to taking it away, and he learned their languages. Quakers also condemned slavery, freed their slaves, and expelled members who continued to keep slaves.

Because broadest terms allows the law flexibility depending on changing society and circumstances.