That map was undoubtedly drawn by a Canadian.
Seriously, it's just cuz the lines of longtitude converge as you go north. So, when you straighten those lines out to draw a FLAT map, the northern land areas are exagerated in size relative to the southern land areas.
Canada and the US are very similar in land area. We're both very close to 3.5 million square miles in size (land only).
Similarities & Differences Between Canada & United States
But, except for Alaska, most of your "land" is soil that you can grow stuff on and that people can live on. Much of Canada's "land" area consists of bare rock and gravel cuz nothing grows on it so you don't get plant matter decomposing to form "soil" over it in the first place.
Here, maybe consider this map. It's a composite map of North America at night:
It almost looks like a map of the United States. But Canada looks nothing like it does on a geographic map because most of our country is uninhabited.
That big population center on the south west shore of Lake Michigan is Chicago. North west of Chicago is Minneapolis, and about the same distance north west of Minneapolis is Winnipeg. We're along the north edge of the populated area of North America.
Yes, everything changes colour here when you go from one province to the next here. That's how we can tell if someone is from a different province.
PS: I have no idea why Peurto Rico is so bright at night. You wouldn't think they'd be lit up like that at night.