Germany and Japan favored military solutions more than the United States did. I think the militaristic nations felt they had more to prove on the world stage. For Germans, rearmament became a point of national pride. For the Japanese, imperialism played a similar role. By contrast, Americans entered World War I reluctantly, and they remained reluctant to enter World War II until the bombing of Pearl Harbor left them with few alternatives.
The first graph is correct (the one with the X-intercept of 2 and y-intercept of -3)
Conciseness, objectivy and accuracy.