Primary sources are created in the time under study.
When is a source a primary source?
A primary source is something that was created in the time under study. A primary source is an original work written by someone who witnessed or wrote close to an event.
A secondary source is created using information provided by someone else. Secondary sources are often created with some distance from the event.
There I found very many islands, filled with innumerable people, and I have taken possession of them all for their Highnesses, done by proclamation and with the royal standard unfurled, and no opposition was offered to me.
CREATED/PUBLISHED: by Christopher Columbus (1451-1506) in Rome: 1493, Rare Book and Special Collections Division, Library of Congress
TITLE: Columbus taking possession of the new country.
CREATED/PUBLISHED: Boston, U.S.A. : Published by the Prang Educational Co., 1893. 1 print : chromolithograph, Prints and Photographs Division, Library of Congress