...In asserting the Monroe Doctrine, in taking such steps as we have taken in regard to Cuba, Venezuela, and Panama, and in endeavoring to circumscribe the theater of war in the Far East, and to secure the open door in China, we have acted in our own interest as well as in the interest of humanity at large... Ordinarily it is very much wiser and more useful for us to concern ourselves with striving for our own moral and material betterment here at home than to concern ourselves with trying to better the condition of things in other nations... Nevertheless there are occasional crimes committed on so vast a scale and of such peculiar horror as to make us doubt whether it is not our manifest duty to endeavor at least to show our disapproval of the deed and our sympathy with those who have suffered by it."
When Roosevelt refers to "the theater of war in the Far East," what conflict is he most likely discussing?