Off to an interesting start. Scottamer's choice reveals the subtlety that may be needed to ferret out more obscure issues.
Jogil's Vimy Ridge was a hidden snag, spotted by EasyOne. Although
use of the land was granted in perpetuity from France, I think it is fair to say that it is, indeed, Canadian soil. To interrupt Rupert Brooke's poem, A Soldier:
"That there's some corner of a foreign field that is forever..." Canada!
Though no soldiers are buried there, it is soaked with Canadian blood. Lest We Forget.
(There is another similar but reversed snag ahead.)
Scottamer may be chagrined to find that his choice was the
third, not second, example.
Here is the second: #216 [1935] George V Silver Jubilee:

According to Collections Canada Archive, the Royal Yacht Britannia, a favourite of King George V, was a sensation in the yachting world and won 231 first prizes and 129 others out of a total of 625 starts.
The Royal Yacht "Victoria & Albert" can be seen in the left background steaming away and that is the ship that would circumnavigate the globe, not the racing yacht which is seen here off the coast line of somewhere - England probably - but definitely not Canada!
Jogil snuck in the sixth: #394 [1961] The Colombo Plan

It shows a hydro-dam being built under supervision of Canadian engineers, probably in Pakistan, given the headdress of the man on the right.
I wonder what is the fourth?
PS. Don't forget to include a picture and a brief explanation. And one-a-day.