The most influential factor in ending the traditional indian way of life was: the death of famous leaders such as geronimo and sitting bull. voluntary settlement on reservations. their constant intertribal warfare. the virtual extermination of the buffalo.

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The correct answer that would best complete the given statement above would be third option. The most influential factor in ending the traditional Indian way of life was their constant intertribal warfare. Hope this is the answer that you are looking for. 
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