europe VS usa!

ok lets say 10 -15years down the road relations break down and it comes to war!and both europe and USA have their new weapons up and running such as f22 f35 new american carriers and then the rafale is fully operational as is the eurofighter and new royal navy carriers new french carrier aswell and even the new italian carrier+europeans have f35to and europe has sorted out its differences and its armies can operate side by side!its all out war!you can finsh the script yourselves!(oh and maybe by then the USA is locked in a war with say maybe china or north korea and has commitments over there!)how would it all play out?

i know it would never happen but lets pretend!?