---
title: "Second Sino-Japanese War — AP World Definition & Exam Guide"
description: "Second Sino-Japanese War (1937-1945): Japan's invasion of China for raw materials and empire. Key for AP World Unit 7 total war and Japanese imperialism DBQs."
canonical: "https://fiveable.me/ap-world/key-terms/second-sino-japanese-war"
type: "key-term"
subject: "AP World History: Modern"
unit: "Unit 7"
---

# Second Sino-Japanese War — AP World Definition & Exam Guide

## Definition

The Second Sino-Japanese War (1937-1945) was Japan's full-scale invasion of China, fought against both Nationalist and Communist Chinese forces and driven by Japan's need for raw materials and strategic control. In AP World, it's the Asian opening of World War II as a total war (Topic 7.7).

## What It Is

The Second Sino-Japanese War was Japan's invasion of China starting in 1937, which dragged on until Japan's surrender in 1945. Japan was a resource-poor industrial empire, and China had the land, labor, and [raw materials](/ap-world/key-terms/raw-materials "fv-autolink") Japan wanted. Chinese resistance came from two rival groups, the Nationalists and the Communists, who temporarily set aside their civil war to fight the invader.

For [AP World](/ap-world "fv-autolink") purposes, this war matters as a case study in **total war**. Japan mobilized its entire society for the fight, using intense [nationalism](/ap-world/unit-5/enlightenment/study-guide/baHBawqOSScLKnFlhLX2 "fv-autolink") and Emperor Hirohito's cult of emperor ideology to convince ordinary citizens that the war was a sacred duty. Once Japan attacked Pearl Harbor in 1941, this regional conflict merged into the larger Pacific theater of World War II, which is why many historians treat 1937, not 1939, as the real start of WWII.

## Why It Matters

This term lives in **Topic 7.7 (Conducting World War II)** within **[Unit 7](/ap-world/unit-7 "fv-autolink"): Global Conflict, 1900-Present**. It directly supports learning objective **AP World 7.7.A**, which asks you to explain similarities and differences in how governments conducted war. Japan in China is a textbook example of the CED's essential knowledge on [total war](/ap-world/key-terms/total-war "fv-autolink"). The government used propaganda, intensified nationalism, and emperor-centered ideology to mobilize the whole population and repress dissent.

It also keeps the AP narrative honest about geography. The exam rewards a global view of WWII, not a Europe-only one, and the Second Sino-Japanese War proves the conflict began in Asia. It's also the endpoint of the Japanese imperialism story that the 2024 DBQ asked about, so it does double duty as evidence for both Topic 7.7 and questions on causes of [imperialism](/ap-world/unit-6/rationales-for-imperialism-1750-1900/study-guide/SpRzOFVRtT5Quq4copYW "fv-autolink").

For the bigger picture, link up to the [7.7 Conducting World War II study guide](topic 7.7).

## Connections

### [Axis Powers (Unit 7)](/ap-world/key-terms/axis-powers)

Japan's war in China is what made Japan an Axis aggressor before Germany ever invaded Poland. When you map the Axis, remember that Japan's front opened in 1937, two years ahead of the European war.

### Emperor Hirohito's Cult of Emperor Ideology (Unit 7)

This [ideology](/ap-world/key-terms/ideology "fv-autolink") was Japan's mobilization engine. Framing the emperor as divine turned the invasion of China into a sacred mission, which is exactly the kind of ideological mobilization 7.7.A wants you to compare with fascism and communism in Europe.

### [Bombings on Hiroshima and Nagasaki (Unit 7)](/ap-world/key-terms/bombings-on-hiroshima-and-nagasaki)

The atomic bombs ended both the Pacific War and the Second Sino-Japanese War at the same moment in 1945. China's eight-year war only stopped when Japan surrendered to the Allies, which shows how completely the two conflicts had merged.

### [Battle of Stalingrad (Unit 7)](/ap-world/key-terms/battle-of-stalingrad)

Stalingrad is your European comparison point for grinding, society-consuming [warfare](/ap-world/key-terms/warfare "fv-autolink"). Pairing China's resistance against Japan with the Soviet defense at Stalingrad gives you a ready-made similarities-and-differences answer for how governments conducted total war on two continents.

## On the AP Exam

Multiple-choice questions usually test this war through the lens of total war and mobilization, often pairing a Japanese propaganda source or a document on Japanese expansion with a question about why governments could mobilize entire populations. You're expected to connect Japan's invasion of China to resource needs, nationalism, and ideology, not to memorize individual battles.

On the free-response side, the 2024 DBQ asked you to evaluate the extent to which economic motives were the leading cause of Japanese imperialism circa 1900-1945, and the Second Sino-Japanese War is the climax of that exact period. Use it as evidence that Japan's expansion was driven by raw materials and strategic control, then complicate the argument with ideological motives like the cult of the emperor. It also works as a continuity example in LEQs about 20th-century global conflict, since it lets you argue WWII began in Asia in 1937.

## Second Sino-Japanese War vs First Sino-Japanese War

Same rivals, different eras. The First Sino-Japanese War (1894-1895) was a short conflict where newly industrialized Meiji Japan defeated Qing China and took Taiwan, announcing Japan as an imperial power. The Second Sino-Japanese War (1937-1945) was a massive eight-year invasion of mainland China that merged into World War II. If the question is about Japan's rise as an imperial power, it's the first war. If it's about total war and WWII, it's the second.

## Key Takeaways

- The Second Sino-Japanese War began in 1937 when Japan launched a full-scale invasion of China to secure raw materials and strategic control.
- Japan fought both Nationalist and Communist Chinese forces, who paused their civil war to resist the invasion together.
- The war is a core example of total war for AP World 7.7.A, with Japan using propaganda, intensified nationalism, and emperor ideology to mobilize its whole society.
- After Pearl Harbor in 1941, the war merged into the Pacific theater of World War II and ended only with Japan's surrender in 1945.
- Because fighting started in Asia in 1937, this war supports the argument that World War II began before the 1939 invasion of Poland.
- It is the endpoint of the Japanese imperialism story tested on the 2024 DBQ about economic motives for expansion circa 1900-1945.

## FAQs

### What was the Second Sino-Japanese War?

It was Japan's invasion of China from 1937 to 1945, fought against both Nationalist and Communist Chinese forces. Japan wanted China's raw materials and strategic position, and the conflict eventually merged into World War II.

### Is the Second Sino-Japanese War part of World War II?

Yes. After Japan attacked Pearl Harbor in 1941, the China war became part of the Pacific theater, and both ended with Japan's 1945 surrender. Many historians argue WWII actually started in 1937 with this invasion, not in 1939 in Europe.

### How is the Second Sino-Japanese War different from the First Sino-Japanese War?

The First Sino-Japanese War (1894-1895) was a brief conflict where Japan beat Qing China and gained Taiwan, marking its debut as an imperial power. The Second (1937-1945) was an eight-year total war involving the full-scale invasion of mainland China during the WWII era.

### Why did Japan invade China in 1937?

Japan was a resource-poor industrial empire that needed raw materials, land, and strategic control, and China offered all three. Nationalist and emperor-centered ideology then framed the invasion as Japan's sacred mission, which is the economic-versus-ideological tension the 2024 DBQ on Japanese imperialism asked you to weigh.

### Do I need to know battles of the Second Sino-Japanese War for AP World?

No, the exam doesn't test individual battles in China. You need the big picture for Topic 7.7: why Japan invaded, how it mobilized its population for total war, and how the conflict connected to World War II.

## Related Study Guides

- [7.7 Conducting World War II](/ap-world/unit-7/conducting-world-war-ii/study-guide/Mr6WmN2jcIXgQKNTIblg)

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