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A primary source is an original document containing firsthand information about a topic. Primary sources are the direct evidence or first-hand accounts of events without secondary analysis or interpretation. A primary source is a work that was created or written contemporary with the period or subject being studied.
A secondary source contains commentary on or discussion about a primary source. The most important feature of secondary sources is that they offer an interpretation of information gathered from primary sources.
Primary Resource - The Federalist papers / Alexander Hamilton, James Madison, and John Jay
Secondary Resource - The Anti-Federalist papers ; and, the constitutional convention debates