In traditional Native cultures, a person's word is sacred and history told by one generation to the next is trusted.
Increasingly in modern American society, Native oral history accounts are disbelieved until and unless they can be substantiated by documents from non-Native sources. Some of these sources seem to have full-time jobs coming up with documents to undercut Native oral history, especially involving ongoing court cases.
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One bounty proclamation from the Massachusetts Bay Province in 1755 required ''pursuing, captivating, killing and Destroying all and every of the
Indians.'' It promised to pay 50 pounds for male prisoners; 25 pounds for female or boy prisoners; and 40 pounds for scalps of males and 20 pounds for scalps of females and boys ''that shall be killed and brought in as Evidence of their being killed.''
Since bounties were paid on a sliding scale for Indian men, women and children, the bounty hunters had to produce either the whole bodies or the skinned genitalia in order to authenticate their claim. Scalps from the heads alone would not provide the required proof of adulthood or gender.
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http://www.indiancountry.com/content.cfm?id=1096411772