Why were new weapons needed in World War 2?
That's Simple. To get ahead of the Enemy. War is all about
getting ahead of your enemy in anyway possible, sometimes by
numbers somtimes by development of new arms. Take ,for example,
near the end of WWII, Hitler's Germany developed the First Jet
fighter, it was nearly unparelled, fortunetly for the world, it
came too late. The Lufwaffa (germany's Air Force) was nearly out of
money and out of skilled pilots. If the Jet came say, in 1943, We
might not have won. Glad to Help