The Tripartite Pact (September 27, 1940) was specifically aimed at the United States to prevent separate wars. Any act of war by the United States against Japan would be considered an act of war against Germany and Italy. Read Article 3.
The Governments of Japan, Germany, and Italy consider it as the condition precedent of any lasting peace that all nations in the world be given each its own proper place, have decided to stand by and co-operate with one another in their efforts in Greater East Asia and the regions of Europe respectively wherein it is their prime purpose to establish and maintain a new order of things, calculated to promote the mutual prosperity and welfare of the peoples concerned. It is, furthermore, the desire of the three Governments to extend cooperation to nations in other spheres of the world that are inclined to direct their efforts along lines similar to their own for the purpose of realizing their ultimate object, world peace. Accordingly, the Governments of Japan, Germany and Italy have agreed as follows:
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ARTICLE 1. Japan recognizes and respects the leadership of Germany and Italy in the establishment of a new order in Europe.
ARTICLE 2. Germany and Italy recognize and respect the leadership of Japan in the establishment of a new order in Greater East Asia.
ARTICLE 3. Japan, Germany, and Italy agree to cooperate in their efforts on aforesaid lines. They further undertake to assist one another with all political, economic and military means if one of the Contracting Powers is attacked by a Power at present not involved in the European War or in the Japanese-Chinese conflict.
ARTICLE 4. With a view to implementing the present pact, joint technical commissions, to be appointed by the respective Governments of Japan, Germany and Italy, will meet without delay.
ARTICLE 5. Japan, Germany and Italy affirm that the above agreement affects in no way the political status existing at present between each of the three Contracting Powers and Soviet Russia.
ARTICLE 6. The present pact shall become valid immediately upon signature and shall remain in force ten years from the date on which it becomes effective. In due time, before the expiration of said term, the High Contracting Parties shall, at the request of any one of them, enter into negotiations for its renewal.
In faith whereof, the undersigned duly authorized by their respective governments have signed this pact and have affixed hereto their signatures.
