Why did one of these economies collapse, while the other has had success?

Was the us justified in using the atomic bomb on hiroshima and nagasaki? why or why not?

What was president nixon’s approach of using tension between us and other nations

Even though both ww1 and ww2 were in many ways the same conflict with basically the same countries facing off against each other, the way each war started was significantly different. the question is how what were the differences on how they started