Members of the yurok, karuk, hupa, and tolowa used valued items such as obsidian blades, white deer skins, and elaborately carved paddles and spoons to

reinforce social position.

Explanation:

The Yurok, Karuk, Tupa, and Tolowa are tribes of Native American people who reside in the Northern region of California. These tribes share comparably similar cultural practices and customs with another. One among such similarities was the practice of displaying wealth and social position in the society. The natives from these tribes would use valued items such as obsidian blades, white deer skins, and elaborately carved paddles and spoons to reinforce social position.