Japan and World War I

Japan’s Post–World War I Foreign Policy: The Quest for a Cooperative Approach

In the wake of World War I, Japan shifted its foreign policy stance, particularly with regard to China, turning away from imperialism and seeking to act in concert with the other great powers. Historian Sakurai Ryōju explains the events and thinking behind this shift.

The Washington Conference and Japan’s Cooperative Foreign Policy Line

The top issue addressed at the Paris Peace Conference was the postwar settlement with Germany, and the “Versailles system” established under the Treaty of Versailles at the end of the conference referred mainly to the postwar arrangements for Europe. Matters relating to Asia were not a major topic, and the issue of China was excluded from consideration. At the Washington Conference that was convened in November 1921, the agreements signed, in addition to the Five-Power Treaty on naval disarmament, included a Four-Power Treaty (Britain, France, Japan, and the United States) on preserving the status quo regarding interests and armaments in the Pacific and a Nine-Power Treaty on the Open-Door Policy for China and preservation of its territorial integrity. Also, Japan and China concluded a treaty concerning Shandong under which it was agreed that the former German interests on the Shandong Peninsula would be returned to China and that Japan would remove the military forces it had stationed along the Shantung (Shandong) Railway. This new set of arrangements for East Asia came to be called the Washington system. But some observers judge that this consisted merely of agreements among the great powers to preserve the status quo, and that the new East Asian order was built on sacrifices by China.

Shortly before the Washington Conference, Prime Minister Hara was assassinated, and a new cabinet was formed under Takahashi Korekiyo. The policy it adopted vis-à-vis the conference was to accept the Open Door Policy, which was the principle espoused by the United States with respect to China, but to strive to maintain Japan’s existing interests. Regarding disarmament, though there was some opposition from the Imperial Navy, Japan agreed to the limitation of its capital ship tonnage to 60% of the levels set for Britain and the United States, taking into account its own fiscal situation. Meanwhile, in the first article of the Nine-Power Treaty the parties agreed to “respect the sovereignty, the independence, and the territorial and administrative integrity of China”; this amounted to a rejection of the actions Japan had taken during World War I, but the Japanese government accepted it, because it did not negate Japan’s interests in South Manchuria.

To sum up, Japan’s foreign policy after World War I was grounded in international cooperation and followed the pacifist current of the time. The adoption of this line has been attributed to the diplomatic isolation Japan experienced and the failure of the Siberian Intervention. The Anglo-Japanese Alliance was not renewed, Tsarist Russia, which had effectively been an ally during the war, collapsed, and differences between Japan and the United States with respect to China intensified. All these developments are seen as having affected Japan’s stance.

Initiatives Aimed at Maintaining Japan’s Influence in China

We should not forget, however, that during this period Japan also continued to pursue active, strategic initiatives as part of its China policy grounded in international cooperation.

At a meeting of the Advisory Council on Foreign Relations on December 8, 1918, participants discussed the approach Japan should take to the upcoming Paris Peace Conference. The argument advanced at this meeting was that, with respect to China, Japan should take the initiative in calling for the end of extraterritorial rights and the removal of foreign military units; it was suggested that this would be to Japan’s advantage in its future China policy, promoting the “opening of new fields and establishment of new footholds.” The idea was that in order for Japan to maintain influence over China, it needed to preemptively implement the China policy espoused by the United States, that is to say, stop interfering in China’s domestic affairs, respect its independence and sovereignty, and await its development. However, these matters were not taken up in the Paris talks.

For Japan at this juncture, securing its influence in Manchuria was the priority. China south of the Great Wall was in the midst of a de facto civil war, and if Japan were to intervene in this conflict, there was a danger that the other powers would follow suit and that China would end up being partitioned among them. In fact there had been moves among the great powers toward placing China under international control, something that Japan was determined to prevent. So it is fair to say that the Japanese government needed to take the lead in moving toward a policy of benevolent observation, trusting in China’s own efforts to recover from its turmoil and achieve unity. 

Japan continued to follow this line after the Washington Conference. At the end of June 1922 it pulled its military forces out of Hankou. In addition, on May 30 the cabinet decided to withdraw the forces that had been stationed in northern China ever since the Boxer Rebellion. Needless to say, this was an expression of the stance of Japan’s Foreign Ministry and its military, which had been shifting toward an approach aimed at seeking to conduct Japan’s China policy advantageously by displaying friendliness and extending benefits; in this way Japan hoped to recover from the damage it had suffered in its international position as a result of its actions during World War I. 

Britain did not approve of the proposed withdrawal of the international garrisons in Beijing, and so Japan did not implement its cabinet decision, fearing to depart from the cooperative line of its foreign policy. But the fact that this decision was adopted disproves the conventional assessment that Japan was forced to accept the “Washington system” because of its weak position. In fact, the Japanese government was trying to find a new path for its China policy by making use of the Washington system.

(Originally published in Japanese on July 11, 2014. Title photo: Scene from the 1919 Paris Peace Conference convened to negotiate a settlement to World War I. Photo by TopFoto/Aflo.)

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diplomacy United States China East Asia World War I Paris Peace Conference Washington Conference

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