"Sir Martin Frobisher and his crew are credited as the first Europeans to celebrate a Thanksgiving ceremony in North America, in 1578 [Frobisher Bay area of Baffin Island in the present Canadian Territory of Nunavut]. They were followed by the inhabitants of New France under Samuel de Champlain in 1606. "
So, just like
Baseball, it's another thing the US has appropriated from Canada.
The Frobisher narrative is considered
far from universally accepted. I *will* give you that we *both* 'inherited' Thanksgiving, if you will, from Britain, since we have common ancestry there (it started off as 'holiday consolidation', b/c the Catholic church at the time seemingly had an obligatory feast every other day, including 52 Sundays. When England's Reformation began under Henry VIII, 90-some-odd days got cut down to 27, plus the occasional 'ad hoc' feast day here and there). All the feasts got in the way of necessary work, plus they cost money - so people were glad to have them cut back, for the most part
There's more evidence to suggest that it came to Canada via the French ('Action de Grace'; apologies for the missing diacritical)
Back to Thxgiving... it didn't 'take off' in Canada until the Loyalists (US: Tories) gradually brought it over from the US as they arrived (voluntarily or via expulsion; take your pick)
That's when the turkey hit your tables, as well.
Now, about baseball... I don't care *what* the facts say... that's 'our' game. Abner said so...lol.
If I must, I'll give you basketball, since it's considered a 'minor' sport here - even so, it's a few rungs in popularity above <wait for it>... ice hockey.
'All in good fun', said the man who has an Original Six team in his town (wearing the best damned sweater in *all* of hockey)