When European settlers came over to the New World, they brought many diseases with them that the Native Americans had no immunity to. For this reason, they started dying from sicknesses and decrease their numbers by the millions.
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Answer:
Its C:The Freedmen’s Bureau helped protect African Americans.
One important advantage that primary soruces have over secondary sources is that primary sources offer a firsthand account of an event - b, which isn't the case with secondary sources. Although this leaves primary sources prone to being biased compared to secondary sources.