According to “fireside chat #19” what has america done to prepare for war while all of europe was already in the war?

the one that America has donee to prepare for war while all of Europe was already in war was : C. ammunition and war machines have been produced in large quantities Back then , the majority of US Gross domestic products was dominated by war-related goods because many companies were assign to produce it hope this helps

Ammunition and war machines have been produced in large quantities.

APEX

the objective should be switched