Ok so this is what I think should happen.
Interwar is kinda boring. I do love the mechanics in place as playing Britain as I am nerfed in terms of numbers, but I think by not singing the Washington Naval Treaty (I LOVE ME MA BATTLESHIPS! SUCKS TO EVERYONE MUHAHAHAHAHA) It should lead to some kind of event chain rather than -10 decent or whatever it was. I.E. Perhapse nationalism? Anglo-Germanic/Italian Alliance? Or even a potential war between the commonwealth and the United States during the interwar years considering plans to invade Canada were in place (along with a briliant plan to defend my homeland I might add). Operation Red, look it up boys. As for the division of the United States or its defeat, I think someone else should make the event but I would hightly suggest not messing with very much of the contanental United States (to prepare for its allingment later to whatever faction) and its overseas posessions/alaska should be absorbed into the commonwealth. I guess this will give the United States the opertunity to go down 3 paths with such events, democracy, some kind of crazy communist revolution or some kind of nationalistic revolution (I would beleive somewhere between nationalistic democracy would be most likeley knowing the United States at the time, but who knows, someone here probobly knows of some movements in the 1920's that could lead the USA down the other two paths). Setting the USA up for a seccond war with Britain is kinda interesting but obviously this kind of situation should be better though out in greater detail.
So yeah if you guys like this idea great. If not then mkay. But just consider that later down the line development of the interwar period should occure but leading to the big conflict by 1939. Or, an option to play historicly obviously but with a bit more to do. Again, I really love the mechanics in place so I dont have 5000 BB's and 100 Million Infantry as Britain by WW 2. xD