Alliance commitments make an American war wider

The scenario begins with coalition mechanics and the scope of the Anglo-Japanese Alliance. A bilateral war alone did not trigger intervention, while a conflict against multiple enemies brought the alliance into play. An American alignment with Germany and the Central Powers would create that wider struggle, giving Japan a route into the conflict on Britain’s side. American interests in the Pacific would then face another major navy within the opposing coalition. Treaty language and coalition size have direct strategic consequences here.