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Follow Affiliated Tribes of Northwest IndiansIn 1953 farsighted tribal leaders in the Northwest formed the Affiliated Tribes of Northwest Indians (ATNI), and dedicated it to tribal sovereignty and self-determination.Today, ATNI is a nonprofit organization representing 57 Northwest Tribal governments from Oregon, Idaho, Washington, Alaska, California and Montana.ATNI Conventions are a place to gather, learn, develop policy positions and share knowledge.