Canadians, and for that matter the Australians and New Zealanders, don't get much mention in history texts produced outside of their own nations. That's really to bad, as the things that they have done, especially in WWI, are so amazing that if someone here were to put that into one of their timelines we would inevitably dismiss it as 'ASB'. A good example is the last 100 days of the Great War, where the Canadian Corps effectively destroyed one third of the entire German Army in a series of battles (beginning with Amiens, where we were right beside the Aussies...) that only ended with the Armistice on 11 November 1918. Which occured right after the Canadian Corps took Mons, Belgium, that very morning. That allowed the British to claim that they ended the War exactly where it began... Put that into a TL and everyone would call it a Wank and dismiss it as being implausible at best and ASB at worst. Ditto for the performance of the ANZACs that occured at the same time.
As for the Newfies, Dominion Day (July 1st) is not a day of celebration. 1 July 1916 was the day the Royal Newfoundland Regiment was obliterated at Beaumont-Hamel on the first day of the Battle of the Somme. And the Great War destroyed Newfoundland as a nation, (they lost a lot of people, and wound up going deep into debt trying to support their soldiers), which eventually led to them winding up as our 10th province.