Actually it was a country long before I was born in 1970.

Dominion of Canada is the country’s formal title, though it is rarely used. It was first applied to Canada at Confederation in 1867. It was also used in the formal titles of other countries in the British Commonwealth. Government institutions in Canada effectively stopped using the word Dominion by the early 1960s. The last hold-over was the term Dominion Day, which was officially changed to Canada Day in 1982. Today, the word Dominion is seldom used in either private or government circles.

~ https://www.thecanadianencyclopedia.ca/en/article/dominion

April 17, 1982: The Constitution Act, 1982, via the Canada Act 1982, made Canada completely independent of the United Kingdom, removing the requirement to involve the British parliament in amending the Canadian constitution.

~ https://en.wikipedia.org/wiki/Territorial_evolution_of_Canada

"completely independent" = bullshit.

FYI, half of your crappy "American" TV shows are made in Canada. I've worked on some. In 1991 or 1992 I turned the town of Markham, Ontario into the completely fictional town of Hopewell, Connecticut for a shitty TV movie The Rapture, among other movies I art-directed on. Our grants for corporate media entertain you.