18thcentury 19thcentury africanamericans andprotectingsuchofthemashavebeen antislaverymovements civilrights freeafricanamericans history historynew-yorksocietyforpromotingthemanumissionofslaves historypennsylvaniasocietyforpromotingtheabolitionofslavery middleatlanticstates new-yorksocietyforpromotingthemanumissionofslaves pennsylvaniasocietyforpromotingtheabolitionofslavery politicalactivity racerelations