B3, key topic 5 - Depression, empire and collapse, 1931–45

Tenko And Thought Control

Tenko means ideological conversion. In this lesson, it refers especially to Japanese socialists and communists being pressured to reject communism and accept loyalty to the emperor-centred state. The official key topic calls this "rejecting communism", but it was not just a private change of mind. It was part of a wider system of political control.

The background was the Peace Preservation Law of 1925, which targeted movements that challenged private property or the imperial kokutai, the idea of Japan's national polity centred on the emperor. In the late 1920s and early 1930s, police and prosecutors used the law against communists, socialists, labour activists and radical intellectuals. By the early 1930s, the authorities increasingly preferred conversion as well as punishment: if a prisoner or suspect renounced communism, that could be used as evidence that they had been "corrected".

Tenko had several political effects:

The social effects were personal as well as political. Former radicals could return to families or work, but often under suspicion and supervision. Some carried shame because they had abandoned comrades. Others redirected old social concerns into nationalist or imperial language. In literature, Tenko became a painful subject because it raised the question: if a confession is forced, does it reveal true belief or only the pressure of the state?

Tenko therefore belongs at the start of this lesson because it shows one way Japan's political culture narrowed before and during war. Opposition was not only defeated by elections or argument. It was investigated, recast as disloyalty and pressured to speak the language of emperor, nation and empire.

Return To Military Rule

The specification uses the phrase "return to military dictatorship". Japan in the 1930s did not become a dictatorship in exactly the same way as Nazi Germany or Stalin's USSR: there was no single party leader replacing all institutions. But civilian party government lost the ability to control the armed forces. Cabinets depended on military cooperation, army and navy ministers could make or break governments, and officers could push policy through violence or direct action.

Several causes pushed Japan in this direction.

First, the Great Depression damaged trust in party politicians. Falling silk exports, rural poverty, unemployment and anger at big business made many people more willing to listen to arguments that parliamentary politics was selfish, corrupt or too weak to solve national problems.

Second, military officers argued that Japan needed empire to survive. Japan lacked many raw materials and feared dependence on foreign trade. Expansion in Manchuria and later Southeast Asia promised land, coal, iron, markets, food and strategic security. This made the army's continental ambitions seem, to supporters, like national survival rather than aggression.

Third, political violence weakened civilian rule. In 1930, Prime Minister Hamaguchi Osachi was shot and later died from his wounds. In May 1932, Prime Minister Inukai Tsuyoshi was assassinated by naval officers. The result was not the restoration of firm civilian authority. Instead, party cabinets effectively ended for the rest of the prewar period. In February 1936, young army officers attempted a coup and murdered leading figures including Finance Minister Takahashi Korekiyo. The revolt failed, but it showed how far political violence had entered the centre of government.

Fourth, the army was hard to discipline. The Kwantung Army in Manchuria often acted first and left the government in Tokyo to cope afterwards. When unauthorised action produced success, it taught a dangerous lesson: bold military action could create facts on the ground that civilian politicians struggled to reverse.

The political effects were profound:

Misconception check: the army was not always united. There were rival factions and disagreements over strategy. But those conflicts did not restore liberal democracy. After the February 1936 revolt, the more disciplined Control Faction gained influence, and military power over government became more organised.

Model explanation:

Military dictatorship returned in Japan because economic crisis and nationalist anger undermined party politics, while the armed forces offered expansion as a solution. The Manchurian Incident showed that field officers could act independently, and assassinations such as the May 1932 killing of Inukai weakened civilian confidence. As a result, Japan moved towards government in which civilian cabinets survived only by accommodating military demands.

Manchukuo, League And Isolation

The Manchurian crisis began on 18 September 1931, when officers of the Kwantung Army staged an explosion near the South Manchurian Railway at Liutiaohu, near Mukden. They blamed Chinese forces and used the incident to justify occupying Manchuria. The civilian cabinet in Tokyo initially called for non-expansion, but the army continued. This showed the central problem of the 1930s: the military could create a crisis faster than the government could restrain it.

Manchuria mattered to Japan for several reasons:

Japan created the puppet state of Manchukuo in March 1932, following the 1931 occupation. The former Chinese emperor Puyi became its figurehead, but real power lay with Japanese military and colonial interests. This let Japan claim that Manchukuo was independent, while critics argued that it was the product of conquest.

The League of Nations investigated through the Lytton Commission. The League did not simply deny all Japanese interests in Manchuria, but it rejected the idea that Manchukuo should be accepted as a legitimate independent state created by local self-determination. In February 1933, the League Assembly censured Japan over Manchuria. Japan responded by walking out and giving formal notice of withdrawal from the League in 1933.

This was a turning point in relations with the West. Japan was now more isolated from the international order created after the First World War. The League could not force Japan out of Manchuria, so Japanese militarists could claim that international criticism was weak or hypocritical. At the same time, Western governments increasingly saw Japanese expansion as a threat to China, treaty rights, trade and the balance of power in Asia.

The Manchukuo crisis therefore had two linked effects:

1. It strengthened the army inside Japan because unauthorised expansion had not been reversed.
2. It worsened Japan's international position because Japan chose empire over League cooperation.

For Paper 2, Section B, remember the breadth theme of external influence. Earlier in Japan's transformation, Western pressure helped force Japan to modernise. By the 1930s, Japanese leaders increasingly argued that Western influence and Western-led international rules were obstacles to Japan's rightful empire.

Co-Prosperity And War With The West

Japan's empire was justified through the language of liberation and cooperation. In 1938, Prime Minister Konoe Fumimaro announced a "New Order in East Asia" during the war against China. By 1940, this language developed into the Greater East Asia Co-Prosperity Sphere. The slogan suggested that Asian peoples would unite against Western imperialism and build shared prosperity.