---
title: "AP World History Claims and Evidence in Sources"
description: "Learn AP World History: Modern Claims and Evidence in Sources. Identify claims, find supporting evidence, compare two sources, and explain how evidence works."
canonical: "https://fiveable.me/ap-world/historical-thinking-skills/claims-and-evidence-in-sources/study-guide/dEErNEgNto1ifqXWhflC"
type: "study-guide"
subject: "AP World History: Modern"
unit: "**Historical Thinking Skills"
lastUpdated: "2026-06-18"
---

# AP World History Claims and Evidence in Sources

## Summary

Learn AP World History: Modern Claims and Evidence in Sources. Identify claims, find supporting evidence, compare two sources, and explain how evidence works.

## Guide

## Overview

[AP World History: Modern](/ap-world "fv-autolink") Claims and Evidence in Sources is the historical thinking skill where you analyze the arguments in primary and secondary sources. You figure out what a source is arguing, find the evidence it uses to back that argument, compare it to another source, and explain how that evidence supports, modifies, or refutes the main idea.

In plain terms, you read or look at a source and answer two questions: What is this source claiming, and how does it try to prove it? This skill shows up in both multiple-choice questions and free-response questions, so it pays off across the whole exam.

This guide covers all four subskills (3.A, 3.B, 3.C, 3.D) with examples drawn from different periods of the course.

## What Claims and Evidence in Sources Means

Every source has a point. A letter from a king, a map, a political cartoon, a historian's article, a chart of trade data: each one is trying to convince you of something or report something as true.

Two terms to keep straight:

- **Claim or argument**: the main idea the source wants you to accept. It is the "what."
- **Evidence**: the facts, examples, data, or details the source uses to back up that claim. It is the "how" or "proof."

A source can be **text-based** (letters, speeches, treaties, histories) or **non-text-based** (maps, charts, paintings, photographs, cartoons). You analyze arguments in both kinds.

## What This Skill Requires

You need to do four things with sources:

1. Pull out the central claim or argument.
2. Point to the specific evidence the source uses to support it.
3. Compare the arguments or main ideas of two sources.
4. Explain how the claim or evidence supports, modifies, or refutes the source's overall argument.

This is different from sourcing (who made it and why). Here you focus on the content of the argument itself, not just the author's background.

## Subskills You Need

### 3.A: Identify and describe a claim or argument

Find the main point. Ask: What is this source trying to get me to believe or accept?

- In a text, the claim is often stated directly in a thesis sentence or repeated idea.
- In a non-text source like a map or cartoon, the claim is implied. A world map that places one continent at the center is making an argument about importance.

Tip: state the claim in one sentence in your own words. If you can summarize it, you have identified it.

### 3.B: Identify the evidence used to support an argument

Once you know the claim, find what backs it up.

- Evidence can be specific facts, examples, statistics, comparisons, or appeals to authority.
- For example, an architect arguing he built the greatest dome supports it with measurements: a dome "10 feet higher and 6 feet wider" than a rival building.

Tip: underline or note the details that exist only to prove the point. Those are the evidence.

### 3.C: Compare the arguments or main ideas of two sources

Set two sources side by side and ask how their main ideas relate.

- Do they agree, partly agree, or contradict each other?
- Do they emphasize different causes, actors, or outcomes for the same event?

Tip: name the specific point of agreement or disagreement. "Both sources address [imperialism](/ap-world/unit-6/rationales-for-imperialism-1750-1900/study-guide/SpRzOFVRtT5Quq4copYW "fv-autolink")" is too vague. "Source 1 sees imperialism as a civilizing duty while Source 2 sees it as [economic exploitation](/ap-world/key-terms/economic-exploitation "fv-autolink")" is a real comparison.

### 3.D: Explain how claims or evidence support, modify, or refute an argument

This is the reasoning step. You explain the logic, not just label it.

- **Support**: the evidence strengthens or proves the claim.
- **Modify**: the evidence adds nuance or a condition that [changes](/ap-world/unit-7/unresolved-tensions-after-world-war-i/study-guide/vQfwf2zwJRYaD2MiUZyR "fv-autolink") the claim.
- **Refute**: the evidence contradicts or weakens the claim.

Tip: use the word "because." "This statistic supports the author's claim because it shows the trend they describe actually happened."

## How It Shows Up on the AP Exam

All four subskills appear on both multiple-choice and free-response questions.

- **Multiple-choice**: Questions are built around stimulus sources like letters, maps, charts, and images. You may be asked what a source argues, what evidence it uses, or how two sources compare. For example, source-based map questions ask what development a cartographer's choices reflect.
- **Short-answer questions (SAQ)**: Question 1 uses secondary sources and Question 2 uses a primary source. You often identify or describe an argument and compare two scholars' interpretations.
- **Document-based question (DBQ)**: You read multiple documents, identify their arguments, and use that evidence to support your own thesis. Comparing and explaining evidence is central here.
- **Long essay (LEQ)**: While the LEQ has no documents, the habit of identifying claims and weighing evidence carries directly into building your own argument.

This is practical advice based on how the skill is described, not an official scoring rule.

## Examples Across the Course

These show the skill working in different periods and source types.

- **[Networks of Exchange](/ap-world/unit-2/exchange-indian-ocean/study-guide/mYUclryioD6e045jpPb3 "fv-autolink") (1200-1450), a king's letter**: In Béla IV of Hungary's letter to the Pope, the claim is that Hungary deserves the same military aid the papacy sends to overseas Christian campaigns. The evidence includes the 1241 Mongol invasion, the unanswered requests to the Holy Roman Emperor and the king of France, and the warning that Hungary's fall would open Europe to invasion. Identifying both is 3.A and 3.B.
- **[Transoceanic](/ap-world/unit-4/causes-exploration-1450-1750/study-guide/4YUQxFqt2qoCSrgvlDhJ "fv-autolink") Interactions (1450-1750), two maps**: A Genoese navigational map from 1489 and a German world map from the early 1490s make different arguments about geographic knowledge. Comparing what each map emphasizes ([Mediterranean](/ap-world/unit-4/maritime-empires-established/study-guide/qH0WTQywqbJVV9OrAZ2f "fv-autolink") trade cities versus a fuller world picture) is 3.C.

- **[Land-Based Empires](/ap-world/unit-3/expansion-land-based-empires/study-guide/9JJLXvSkF2YFzAM0MdsQ "fv-autolink") (1450-1750), an architect's biography**: Sinan's account of the Selimiye mosque argues [Ottoman](/ap-world/key-terms/ottoman-empire "fv-autolink") builders surpassed Christian architects. The dome measurements serve as evidence. Explaining how those numbers support his claim of superiority is 3.D.
- **Consequences of Industrialization (1750-1900), imperial justifications**: A source defending empire might argue imperialism was a "[civilizing mission](/ap-world/key-terms/civilizing-mission "fv-autolink")" and use ideologies like [Social Darwinism](/ap-world/key-terms/social-darwinism "fv-autolink") as evidence. A second source by colonized people might refute that with examples of exploitation. Comparing and explaining these is 3.C and 3.D.

- **[Globalization](/ap-world/unit-9/resistance-globalization-after-1900/study-guide/UNOZnXixKCtpAMnEyT1Y "fv-autolink") (1900-present), data on technology**: A chart showing rising vaccine coverage or falling [fertility rates](/ap-world/unit-9/advances-technology-exchange-after-1900/study-guide/iTXqQOkeeD9jQ9FpRc7x "fv-autolink") can be the evidence a source uses to claim that medical and reproductive technology reshaped daily life. Reading the data as support for the claim is 3.B and 3.D.

## How to Practice Claims and Evidence in Sources

- For every source, write the claim in one sentence before doing anything else.
- List two or three specific pieces of evidence the source uses. Be concrete.
- When you get two sources, write one sentence naming exactly where they agree and one naming where they differ.
- Practice the verbs support, modify, and refute. For any document, decide which one fits and explain why with "because."
- Mix source types. Work with a map, a chart, a cartoon, and a letter in the same study session so you can handle non-text sources too.
- After a multiple-choice set, go back and label which question tested claim, evidence, comparison, or explanation.

## Common Mistakes

- **Summarizing instead of finding the claim.** A summary lists what happened. A claim is the point the source argues. State the argument, not the plot.
- **Confusing claim and evidence.** The claim is what the author wants you to believe. The evidence is the proof. Do not list the thesis as a piece of evidence.
- **Vague comparisons.** "Both sources are about trade" does not compare arguments. Name the specific point each source makes.
- **Labeling without explaining.** Writing "this supports the argument" earns little. Explain how it supports it.
- **Ignoring non-text sources.** Maps, charts, and images make arguments too. Look at what the creator chose to include, center, or exaggerate.
- **Adding outside opinion.** Stick to what the source actually says or shows. Your job is to analyze its argument, not replace it with yours.

## Quick Review

- This skill is about analyzing arguments in sources, both text-based and non-text-based.
- **3.A**: Identify and describe the claim or argument.
- **3.B**: Identify the evidence that supports the claim.
- **3.C**: Compare the main ideas of two sources.
- **3.D**: Explain how claims or evidence support, modify, or refute the argument.
- A claim is the "what." Evidence is the "how" or "proof."
- All four subskills appear on multiple-choice and free-response questions.
- Always state the claim in one sentence, then find the specific evidence, then explain the connection with "because."