The US will fight a war very soon but not against who you assume but Iran. Israelis and co are also pressuring them hence they will gain OIL from it and it is favourable. Hence they will attempt to raid Venezuela and Iran.. Making an alliance with KSA that is how they will attempt to keep the dollar following.. Because Venezuela, Iran and Russia are already bypassing the Dollar hence KSA alone can't keep the dollar alive but it has to be done collectively and Russia taking Ukraine has activated an attempt to de-dollarize from China which is a major customer.
But the obvious move is an Iran war followed by a Venezuela raid... The US will not go into conflict deemed above the treeshold for a conflict hence the Iran war is next because they have alot of reserves and the nuclear deal will be used as excuse