I strongly favor adjustments to the turn order as a way to balance the game over other more involved tweaks. Its just a very simple way to adjust the game that doesn’t require any additional rules overhead.
I spent a good couple months trying different turn orders, and noted some ideas in this thread… http://www.axisandallies.org/forums/index.php?topic=34157.0
My friend Tony and I tried a few dozen different orders, so the main thing we started doing was to use a roundel line to indicate the turn order of a given game. Our favorite sequences were usually those that had the US roundel last in the line.
The thread linked above was still working on the Halifax model, so there is some extraneous info at the start. Also the standard sequence we set up was alternating Axis to Allies (with the minor Allies following major Allies), so that would be a little different than just yanking the US out and sticking them at the end of the normal OOB sequence, but I will admit a definite preference for the round ending with the Americans since, as mentioned already, that was the norm in all earlier versions.
My favorite order actually had China among the first in the Allied rotation, and the US last, which seemed to mirror entry into the conflict pretty well. And after the first round those two would piggy back onto each other similar to the way America and Russia would piggy back after the first round in earlier versions like Classic and Revised. Anyhow, point being, the map seemed to support a whole host of alternative turn sequences, which leads me to think that simply adjusting the US position to be last in the OOB sequence would be relatively easy to do.
Putting the Americans last also has the game flow pacing advantage of splitting the Anglo American turn, which always seems to drag, since it’s such an involved turn with the UK already managing the dual economy. US last would accelerate things slightly with a speedier alternate back to Axis.
These lines below are more involved, but we enjoyed the most success with roundel sequences shown below on the G40 map, we collapsed the UK into a single economy for our games, but basically you could just go UK Pacific after UK and it’s basically the same thing game flow wise… shows some of the stuff we tried in attaching minor Allies to different major Allies, while still giving an alternating overall sequence between Axis and Allied teams. My favorite was the first line shown, the one that had China go right before Japan, as a minor attached to Russia (basically second position in the overall alternating scheme.) But we had fun with each of these lines… the last line, China last, shows what I think made for a pretty good political pairing of Minors to Majors, and would still allow the Anzac can opener.
But yeah, I think US last would work even in the OOB sequence, without major disruptions to the play balance.