In WW2, the US only jumped in after Pearl Harbour, and would have preferred to concentrate on the Pacific Theatre, but Adolf Hitler decided to actually declare war on them, and that helped Churchill persuade the US President that Europe would take priority. By the time the Japaneses attacked Hawaii our other 'friend' in adversity, the USSR, had already been fighting our cause for 6 months. Perhaps we should remember them ?
The US in only going to act in it's own best interest, so how are we going to match up ? Any negotiations won't be from a position of equal strength.