<prompt> Translate the following text to EnglishTangu mwaka wa 1971, Wanyama wa Gwichin wamekuwa wakishiriki katika mashambulizi ya Alaska, na kwa hivyo hawawezi kupata faida yoyote kutokana na uchimbaji mpya.  <response>: But since the Gwichin opted out of the 1971 Alaska Native Claims Settlement Act, they stand to make no profit from new drilling. 