Americans were unfamiliar with the territories of Vietnam and ended up having to search manually, house by house, allowing the Viet Cong to dig escape tunnels and snipe American soldiers.
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The answer is A. The freedmen's bureau was created to help former slaves. They didn't help out the whites. They helped blacks only. As for B, if your curious as to what organization did that, it was called the Freedmen's School. :)