I have a specific scenario for the US, where it holds the 49° parallel till the Rockies, but due to a small-scale war in Oregon Country, gains the land up to the 52° parallel, forming another 3°-tall state north of OTL Washington and Oregon. For these three states, I'm sure one of them is likely to get named Oregon, but do you think the other two would get named North and South Columbia perhaps?
The second question would be, let's say at some point later, Rupert's Land is sold to the US during the 19th century, in a timeline where the US also held Quebec from the American Revolution. In such a timeline, I'm assuming Rupert's Land didn't get settled much with British settlers, which opted to settle elsewhere in the British Empire. The US creates another row of states along the existing 52° line back towards the east. How wide are these states, how far east do they go, and what would they be named?
My original concept was 'North Columbia' from 49° to 52° N, and from the Pacific to the crest of the Rockies (OTL eastern British Columbia)(. From the crest of the Rockies back east, each state would be 7° wide. I'd guess the borders would be 107° W, 100° W, and 93° W (Athabasca, Manitoba, and Keewatin, with the capitals of Calgary, Regina, and Winnipeg, or their alternate equivalents). The issue here is, if the US held Quebec, and likely formed more than one state from it, there's a state already existing bordering the Great Lakes here, and one at the Ontario peninsula, which wouldn't give land away to new states. They might add land to them though. What would we do with the rest of the northern continent though? How would that be divided up into territories?
This is roughly what I have so far. For Manitoulin, Quebec, and US Newfoundland, after Rupert's Land is gained, how much of it would be added to those states, and how much would stay as a territory? Should I take Manitoulin north to 52° N from Keewatin to Hudson Bay at 79°46' W (OTL Quebec/Ontario border)? Should Quebec go due north from the source of the Ashuapmushuan River to Hudson, with that east going to US Newfoundland?