What factors after 1939 led to u. s. involvement in world war ii?

Select the correct answer from the each drop-down menu.the idea of total war existed in all countries involved in world war i. for example, countries usedto determine howmuch food, rubber, gasoline, and other items each citizen could use during the war. in order to draft more soldiers into the military,many of the nations established a policy of mandatory. some countries also controlled public opinion during the warusingto prevent discouraging news from reaching the public.resetnext