its certainly OUR windows. It makes no difference if its in another country. Resources used to replace broken windows in another planet, means less resources for stuff to build in our own country
planet=country
So then why weren't all these resources being used to build our own country prior to 1942? Answer: We were in a depression. That the war got us out of the Depression is obvious.
You claim it is not so. Yet, you fail to tell us what then did get us out of the Depression.
So, if not the war, then what got us out of the Depression?