Which of the following were true of the northwestern tribes? (select all that apply.) society was divided into three classes: chiefs, freemen, and slaves. they wore elaborate sandals and moccasins. they were wood carvers. they did not believe in slavery. each nuclear family had its own house. potlaches were great parties where the chief was given gifts by all his guests. they harpooned whales. they included the chinook, haida, and nootka. they valued wealth and status . they included the tillamook, tlingit, and yurok.