AI Tutor
If you hand three different modern historians the exact same 19th-century tax ledger, they might write three completely contradictory books.
That is because a secondary source—a text that analyzes, interprets, or synthesizes past events from primary evidence—is never just a list of facts; it is an active argument.
How do you distinguish between the historian's core argument and the dozens of dates, names, and statistics packed around it?

The Architecture of Historical Arguments

A secondary source's central idea is the author's primary interpretive claim about why or how a historical event occurred.
In contrast, supporting details are the specific primary quotations, quantitative data, and case studies used to substantiate that claim.
How can you reliably pull that central claim out of dense, college-level academic prose?

The Extraction Method

First, separate the broad topic from the author's specific stance—the central idea is always Topic + Debatable Stance.
Next, watch for historiographical markers—phrases like 'traditional scholarship suggests,' 'however, the records demonstrate,' or 'this revision indicates'—which signal where the author's unique claim begins.