It's not the same as Québec because they joined in 1867.
The big point is that the "borders at the time of joining confederation" would give them the whole slice. Thiugh I agree it is unlikely they get the whole slice, and the entire thing would be a protracted international legal battle with border disputes for decades.
100 years ago there was rabbit overpopulation. The pelts got turned into something akin to a pullover sweater with hood.