Tallest mountain in:
North America - Mt McKinley, Alaska - 6,194m
Canada - Mt Logan, Yukon - 5,951m
Mexico - Citlaltepetl - 5,754m
BC - Mt Fairweather - 4,670 (most of the mountain is in Alaska, but the summit peak is in BC)
Rockies - Mt Elbert - Colorado - 4,401m
BC - Mt Waddington, Coast Mountains - 4,016m (tallest mountain that's entirely within BC boundary)
The Canadian Rockies - Mt Robson - 3,954m
Vancouver Island - Golden Hinde - 2,195m

I think I've finally found the phrase that describes the idea I've had stuck in my head. Apparently 'vertical relief' means the height of a mountain from the lowlands around it, as opposed to it's height from sea level. In other words, how tall a mountain appears from the bottom has nothing to do with it's height from sea level. Tallest, as opposed to heighest, base-summit as opposed to sea level-summit. Apparently Mt McKinley (Alaska) is taller than Mt Everest in terms of vertical relief. McKinley has the tallest vertical relief in the world, second only to Nanga Parbat (Pakistan). I'll post pictures soon.