I don't believe there is any intention of politics in the placement of this section. I would think it is there merely as the forerunner of the Dominion of Canada series
...but that's the point. The Province of Canada series
wasn't "the" forerunner. The Province of Canada's notes,
together with the notes of NS and NB, were the
equal three forerunners of the Dominion of Canada series, just as the Province of Canada, NS, and NB were the
equal three forerunners of the Dominion itself. I know this may be news to some of us, because we have all spent years if not decades with our Charlton catalogues that paint a different picture.
It is a misconception among many Canadians that the Province of Canada was the "main" forerunner to the Dominion, and that the other provinces were subordinate to it. The misconception spills over to the numismatic and philatelic community too. Province of Canada coins, notes, and stamps get prominent placement at the front of the book as "the" forerunners to the Dominion issues, while issues by the other (equal) provinces get relegated to the appendices at the back of the book.
Politics or not, structuring the catalogue in such a way does a disservice to historical fact and it really should be changed.