Unlike a primary source a secondary source can be

Secondary sources are documents written after an event has occurred, providing secondhand accounts of that event, person, or topic. Unlike primary sources, which provide first-hand accounts, secondary sources offer different perspectives, analysis, and conclusions of those accounts.

Explanation:Tried my best to put it together

Explanation:  A primary source is a source that provides first-hand knowledge of the topic and is as close to the actual source as possible.

A secondary source analyzes, discusses, evaluates, interprets, describes, or otherwise makes a comment about a primary source.

Secondary source examples :

Magazines

Book reviews (or movie reviews)

Dictionaries and encyclopedias

Textbooks

Scholarly journal articles that interpret or analyze someone else’s original research

besides the fact that abraham lincoln abolished slavery, and greatly benefit black people, he had a heavy impact of the definition of what democracy was, and should be.