World war 3

It's been predicted for some time that world war three will start this spring, and with the USA and Russia saber rattling over the Ukraine it's looking more and more lightly.
The US economy is about to take another bit hit , some say the worst ever, war is good for the economy, however I'm not sure the US has thought this through.
Lets be honest, the US doesn't have a great record of winning, the war with Great Briton was close to a draw, and both sides pretty much gave up, WW1 the US entered on Apr 6 1917 (nearly 3 years into the war) and only after Russia had started to collapse which lead to the end of the war.
WW2 the US was over 2 years late arriving, and then only after the Japanese attack on Pearl harbour, and it was 1943 before they actually dropped a bomb on Germany.
 Since then there was Vietnam where the locals in pajamas beat them and they lost so many troops they pulled out.  Iraq where the war was claimed to be to remove Saddam Hussein weapons of mass destruction (which didn't exist) and was actually part of a much earlier plan to invade 7 middle eastern countries (Iraq, then Syria, Lebanon, Libya, Iran, Somalia and Sudan)
Again in Afghanistan the troop losses where heavy, part of the reason for the troops being pulled out, although the country is so destabilised it could be as late a 2024 before the last come home.  Yet again the local people have given the highly trained and well equipped armies a hard time, and it has to be said it's very very hard to fight a war like this against a local people who have never been successfully invaded.  We shouldn't forget the reason for the invasion of Afghanistan either, it was in retaliation for 9/11, a curious choice when 14 of the 19 terrorist hijacker were Saudi Arabian (according to the FBI)
Sadly I don't think Russia, backed by places like North Korea will be anything like as easy to attack as Afghanistan or Iraq, and Russia has nukes and probably isn't afraid to use them.
If we in the UK have any sense we'll keep well out of it, sadly with the politicians we have we'll most lightly be first in, anybody remember those plans for a limited nuclear war in Europe........