Barring something like an U.S. invasion, is there any way that Canada could splinter or fall apart between the years of 1890-1920?
How radical are we talking? Canada's WWI administration was wildly unpopular for pretty sound reasons - I don't think it would take much more to make Quebec rebel at that time, and even a violent change in government/new constitution for the anglophones doesn't seem ASB. But the anglophone provinces have no real problems with each other, so two pieces is as much as it goes, not "splintering".