Side with Israel, of course the alliance would include England, Canada, Australia and New Zealand. As has already been stated, NATO would collapse with out the US military, the only country in Europe that might be able to stand up to us is Russia.
As far as the UN, might be able to put together a peace keeping force, that would last about two days against the US military.
The US would control the air and the seas, it would be very difficult for the UN to due anything to us.
I wont even address what would happen if they tried to put troops on US soil.
Anyways my .02.
[flame] away.