The Second World War was one of the wars in which economic factors played a decisive role. There were wars, such as the Mongol invasions, where economics didn't play a role at all: the Mongols conquered enemies dozens of times larger economically. In modern warfare, however, as combat is mostly mechanized (it was explosive power that created the damage and not muscle power), while states became more organized (and thus could transform the economic resources of their territories into armies and fleet),...