For much of the 18th and 19th centuries, European nations were constantly at war with one another for one reason or another. After the second world war, there hasn't been another military conflict between western, predominantly white nations since. At least not with casualties--no conflicts over territory anymore, no ground battles, naval sea fights, etc. Of course, there was the was the cold war, however no fighting actually took place, obviously. I do believe that WW2 was the war that ended all wars, in the western world that is. All the wars we have seen between then and now have been from third world countries. Do you think now is the time when the powers of the west should destroy the barbaric, third world regimes? Do you believe the savage violence from these developing, backwards countries is a threat to western civilization now that Europe has been at peace for so long? No insults. Serious responses, please.

I know that there were many factors which triggered american decision to enter the war, but which one is the main. How can the american decision to entry the second world war be best explained?

It's about the world fastest aeroplane of the second world war but it has be a propeller driven