Axis & Allies Developer and Playtester; War of the Ring Editor and Playtester
Can't be real sure, and since it's been a few years since this question went up, we may never know, but I think he was asking if the "bump" was a permanent one or just a one-time bonus, and then the U.S. goes back to 52.
It's permanent, as indicated by the "every time it collects income" above.
I have a similar question: What exactly does the U.S. get? I saw in another thread that you noted that they get 77 once the war is on, but that looks like the 52 + 25 from their easy NO's, and maybe 5 more for France. Is that right? Or do they get 77 PLUS the NO's?
The 77 includes the NOs.