"Only economy left?" You know, despite being called a "world" war, no American countries south of the USA were involved, nor most of Africa, India nor European powers like Portugal, Spain, Switzerland or Turkey, and probably others I forget. And this was despite two globe-girdling empires dragging in many of their subject states (e.g. Australia and Canada were dragged into the European theatre).
Also the article was discussing "greatest economy ever for the USA".
Also the article was discussing "greatest economy ever for the USA".