I agree with you, I believe the answer is Iroquois.
The Iroquois (or Haudenosaunee meaning “People of the Longhouse”) are powerful northeast Native American confederacy, which have through history fallowed matriarchal system. They believed that God appointed women as stewards of the land. Women had higher regard in Iroquois clan as they have raised children, they held property and hereditary leadership was passing through their lines. The best representation of the higher status of women in Iroquois clan was through figure of Clan Mother who appointed leaders and had the right to strip them of their leadership.