Primary Sources vs. Secondary Sources: Investigating the Past Like a Historian
In 1912, a twelve-year-old girl named Eva Hart survived the sinking of the Titanic and, decades later, gave recorded interviews describing the icy water and the band still playing on deck. Those recordings are gold to historians. A history book written in 2020 that quotes her interview is useful too — but it's a different kind of source. Knowing the difference between the two is one of the most important skills a historian has.
What You'll Learn
- What makes a source 'primary' versus 'secondary' - Real examples of each type of source - Why historians compare multiple sources instead of trusting just one - How to spot bias or missing information in a source
What Counts as a Primary Source?
A primary source is something created by a person who was actually there, at the time an event happened. That includes diaries, letters, photographs, speeches, government records, and objects like tools or clothing. A letter written by a soldier to his family during the Civil War in 1863, describing what he saw at the Battle of Gettysburg, is a primary source — it comes directly from someone who experienced the event firsthand.
What Counts as a Secondary Source?
A secondary source is created later by someone who studied the event rather than living through it. Textbooks, documentaries, encyclopedia articles, and most books about history are secondary sources — their authors gathered information from primary sources (and other secondary sources) and organized it into a new explanation. A documentary about the Civil War made in 2015 is a secondary source, even if it includes clips of real primary-source letters and photographs inside it.
Why Historians Use Both — and Cross-Check Them
Primary sources feel more 'real,' but they can also be incomplete or one-sided — a soldier's letter only describes what that one person saw from one spot on a battlefield. Secondary sources can pull together dozens of primary sources to build a fuller picture, but the author's own opinions can shape how they tell the story. That's why historians rarely trust a single source. They cross-reference: comparing a soldier's letter to official army records, newspaper reports from the same week, and photographs, to see where the accounts agree and where they don't.
A diary entry written the same day as an event usually contains fresher details than a memoir written 40 years later, but the diary writer might also be missing information others had. Always ask: who made this source, when, and why?
Sort each example into Primary Source or Secondary Source.
Terms
Definitions
Drag terms onto their definitions, or click a term then click a definition to match.
A museum has an original handwritten letter from a pioneer describing her 1852 journey on the Oregon Trail. What type of source is this letter?
Why do historians usually compare several sources instead of relying on just one?
Be a Source Detective
Find three sources about the same historical event (for example, the moon landing, the Titanic, or a local town's founding) — try to find at least one primary source (a photo, letter, or recording) and one secondary source (an encyclopedia entry or textbook page). For each source, write down who created it, when, and whether it is primary or secondary. Then write two sentences comparing what the sources agree on and any detail where they differ.
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