Back in 1866, when the fathers of confederation were planning to merge Canada East, Canada West, New Brunswick, and Nova Scotia into a new country, the question came up of what to call it. It wouldn't be a kingdom, although Victoria would be the Queen. It definitely wouldn't be a republic. Nor would it quite be a colony, since it would be self-governing. Samuel Leonard Tilley happened to read Psalm 72 one morning, and came across verse 8, which reads, "He shall have dominion also from sea to sea, and from the river unto the ends of the earth." He suggested that the new country be named "The Dominion of Canada", and so it became, and remains to this day. Other dominions followed, as Australia, New Zealand, Newfoundland, and South Africa attained dominion status between 1901 and 1910.
So the celebration of Canada's confederation was called "Dominion Day" until the federal government changed the name to "Canada Day" in 1982. But I grew up saying "Happy Dominion Day", and that's still how I prefer to say it. It's not just Canada's birthday, it's also the birthday of a new kind of country.
In 1986, Vancouver hosted Expo '86, a World's Fair on the theme of transportation and communication. (It seemed appropriate, since Canada in general, and British Columbia in particular, has an abundance of geography, but not a lot of population, so connecting scattered settlements has always been a challenge.)
The Canada Pavilion at Expo '86 featured a multimedia presentation with lots and lots of photos from across Canada, projected while a new song called "This is my home" played. I never could go through that presentation without tears coming to my eyes, and to this day, I can't even listen to the song without being affected.