I don't think there would be an analogue of the Liberation of Paris for the Second Great War's American Front. There aren't really any cities that meet or match the cultural significance for it, and from what I can remember from hte books, none of hte cities really escaped battle damage.
I always figured that the partisans were more active due to the geopolitical climate that North America was in, with the USA surrounded by hostile nations, it made sense that the Second Amendment would not be repealed.
Utah and canada were occupied territory after the Great War, and therefore would not be under the Constitution. This means that the Second Amendment would not be applicable to those living in those areas. This would also apply to the CSA after they were defeated after the Second Great War.
I would say sabotage, intelligence gathers, and the occasional assassination. There were even rumors in the books of prostitutes not getting medical treatment for VD and instead spreading it to other CSA troops.
I'm not saying that it was the same carrier, and i didn't really see the implication of that either in the book. I don't even know where you got that idea honestly since it makes no sense anyway. If I had to make a military assessment on why the Japanese only had a single carrier operating...